20112515521 has 8 divisors (see below), whose sum is σ = 22987260864. Its totient is φ = 17238152400.

The previous prime is 20112515477. The next prime is 20112515573. The reversal of 20112515521 is 12551521102.

It is a happy number.

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

It is not a de Polignac number, because 20112515521 - 2¹⁹ = 20111991233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20112515221) 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, 27831 + ... + 202483.

It is an arithmetic number, because the mean of its divisors is an integer number (2873407608).

Almost surely, 2^20112515521 is an apocalyptic number.

It is an amenable number.

20112515521 is a deficient number, since it is larger than the sum of its proper divisors (2874745343).

20112515521 is a wasteful number, since it uses less digits than its factorization.

20112515521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191111.

The product of its (nonzero) digits is 1000, while the sum is 25.

The spelling of 20112515521 in words is "twenty billion, one hundred twelve million, five hundred fifteen thousand, five hundred twenty-one".