1021201554125 has 16 divisors (see below), whose sum is σ = 1274527935408. Its totient is φ = 816917400000.

The previous prime is 1021201554059. The next prime is 1021201554137. The reversal of 1021201554125 is 5214551021201.

It can be written as a sum of positive squares in 8 ways, for example, as 49427516329 + 971774037796 = 222323^2 + 985786^2 .

It is not a de Polignac number, because 1021201554125 - 2¹⁶ = 1021201488589 is a prime.

It is a super-2 number, since 2×1021201554125² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2228159 + ... + 2647091.

It is an arithmetic number, because the mean of its divisors is an integer number (79657995963).

Almost surely, 2^{1021201554125} is an apocalyptic number.

It is an amenable number.

1021201554125 is a deficient number, since it is larger than the sum of its proper divisors (253326381283).

1021201554125 is an equidigital number, since it uses as much as digits as its factorization.

1021201554125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438449 (or 438439 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 29.

Adding to 1021201554125 its reverse (5214551021201), we get a palindrome (6235752575326).

The spelling of 1021201554125 in words is "one trillion, twenty-one billion, two hundred one million, five hundred fifty-four thousand, one hundred twenty-five".