20525151421 has 8 divisors (see below), whose sum is σ = 20763386424. Its totient is φ = 20287603200.

The previous prime is 20525151419. The next prime is 20525151443. The reversal of 20525151421 is 12415152502.

It can be written as a sum of positive squares in 4 ways, for example, as 8000408025 + 12524743396 = 89445^2 + 111914^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20525151421 - 2¹ = 20525151419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20525151421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20525151461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111456 + ... + 231241.

It is an arithmetic number, because the mean of its divisors is an integer number (2595423303).

Almost surely, 2^20525151421 is an apocalyptic number.

It is an amenable number.

20525151421 is a deficient number, since it is larger than the sum of its proper divisors (238235003).

20525151421 is a wasteful number, since it uses less digits than its factorization.

20525151421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343391.

The product of its (nonzero) digits is 4000, while the sum is 28.

The spelling of 20525151421 in words is "twenty billion, five hundred twenty-five million, one hundred fifty-one thousand, four hundred twenty-one".