21071662158 has 16 divisors (see below), whose sum is σ = 42144757200. Its totient is φ = 7023648576.

The previous prime is 21071662151. The next prime is 21071662159. The reversal of 21071662158 is 85126617012.

It is a super-2 number, since 2×21071662158² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21071662151) 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, 281268 + ... + 348216.

It is an arithmetic number, because the mean of its divisors is an integer number (2634047325).

Almost surely, 2^21071662158 is an apocalyptic number.

21071662158 is an abundant number, since it is smaller than the sum of its proper divisors (21073095042).

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

21071662158 is a wasteful number, since it uses less digits than its factorization.

21071662158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119411.

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 21071662158 in words is "twenty-one billion, seventy-one million, six hundred sixty-two thousand, one hundred fifty-eight".