1302120621025 has 27 divisors (see below), whose sum is σ = 1878300172371. Its totient is φ = 892855325040.

The previous prime is 1302120621023. The next prime is 1302120621121. The reversal of 1302120621025 is 5201260212031.

The square root of 1302120621025 is 1141105.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 468763423569 + 833357197456 = 684663^2 + 912884^2 .

It is not a de Polignac number, because 1302120621025 - 2¹ = 1302120621023 is a prime.

It is a super-2 number, since 2×1302120621025² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1302120621023) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 39922374 + ... + 39954976.

Almost surely, 2^{1302120621025} is an apocalyptic number.

1302120621025 is the 1141105-th square number.

1302120621025 is the 570553-rd centered octagonal number.

It is an amenable number.

1302120621025 is a deficient number, since it is larger than the sum of its proper divisors (576179551346).

1302120621025 is an frugal number, since it uses more digits than its factorization.

1302120621025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65230 (or 32615 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Multiplying 1302120621025 by its sum of digits (25), we get a square (32553015525625 = 5705525²).

1302120621025 divided by its sum of digits (25) gives a square (52084824841 = 228221²).

Adding to 1302120621025 its reverse (5201260212031), we get a palindrome (6503380833056).

The spelling of 1302120621025 in words is "one trillion, three hundred two billion, one hundred twenty million, six hundred twenty-one thousand, twenty-five".