20151521034 has 16 divisors (see below), whose sum is σ = 41063477472. Its totient is φ = 6590434448.

The previous prime is 20151521017. The next prime is 20151521041. The reversal of 20151521034 is 43012515102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20151520995 and 20151521013.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31684464 + ... + 31685099.

It is an arithmetic number, because the mean of its divisors is an integer number (2566467342).

Almost surely, 2^20151521034 is an apocalyptic number.

20151521034 is an abundant number, since it is smaller than the sum of its proper divisors (20911956438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20151521034 is a wasteful number, since it uses less digits than its factorization.

20151521034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63369621.

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 20151521034 in words is "twenty billion, one hundred fifty-one million, five hundred twenty-one thousand, thirty-four".