21159529371 has 16 divisors (see below), whose sum is σ = 31391078400. Its totient is φ = 14086720584.

The previous prime is 21159529333. The next prime is 21159529373. The reversal of 21159529371 is 17392595112.

21159529371 is a `hidden beast` number, since 2 + 1 + 1 + 59 + 529 + 3 + 71 = 666.

It is not a de Polignac number, because 21159529371 - 2⁷ = 21159529243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21159529373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 525571 + ... + 564396.

It is an arithmetic number, because the mean of its divisors is an integer number (1961942400).

Almost surely, 2^21159529371 is an apocalyptic number.

21159529371 is a deficient number, since it is larger than the sum of its proper divisors (10231549029).

21159529371 is a wasteful number, since it uses less digits than its factorization.

21159529371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090695 (or 1090689 counting only the distinct ones).

The product of its digits is 170100, while the sum is 45.

The spelling of 21159529371 in words is "twenty-one billion, one hundred fifty-nine million, five hundred twenty-nine thousand, three hundred seventy-one".