20151521334 has 160 divisors (see below), whose sum is σ = 56195884800. Its totient is φ = 5266296000.

The previous prime is 20151521329. The next prime is 20151521359. The reversal of 20151521334 is 43312515102.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20151521298 and 20151521307.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 608709 + ... + 640959.

It is an arithmetic number, because the mean of its divisors is an integer number (351224280).

Almost surely, 2^20151521334 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20151521334, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28097942400).

20151521334 is an abundant number, since it is smaller than the sum of its proper divisors (36044363466).

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

20151521334 is a wasteful number, since it uses less digits than its factorization.

20151521334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32320 (or 32311 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 20151521334 in words is "twenty billion, one hundred fifty-one million, five hundred twenty-one thousand, three hundred thirty-four".