20125464407521 has 8 divisors (see below), whose sum is σ = 21956286348288. Its totient is φ = 18294848178000.

The previous prime is 20125464407519. The next prime is 20125464407539. The reversal of 20125464407521 is 12570446452102.

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 20125464407521 - 2¹ = 20125464407519 is a prime.

It is a super-2 number, since 2×20125464407521² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20125464407621) 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, 51223210 + ... + 51614611.

It is an arithmetic number, because the mean of its divisors is an integer number (2744535793536).

Almost surely, 2^{20125464407521} is an apocalyptic number.

It is an amenable number.

20125464407521 is a deficient number, since it is larger than the sum of its proper divisors (1830821940767).

20125464407521 is a wasteful number, since it uses less digits than its factorization.

20125464407521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102855623.

The product of its (nonzero) digits is 537600, while the sum is 43.

The spelling of 20125464407521 in words is "twenty trillion, one hundred twenty-five billion, four hundred sixty-four million, four hundred seven thousand, five hundred twenty-one".