21323216958 has 16 divisors (see below), whose sum is σ = 42679330320. Its totient is φ = 7102256256.

The previous prime is 21323216953. The next prime is 21323216987. The reversal of 21323216958 is 85961232312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323216953) 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, 1362253 + ... + 1377816.

It is an arithmetic number, because the mean of its divisors is an integer number (2667458145).

Almost surely, 2^21323216958 is an apocalyptic number.

21323216958 is an abundant number, since it is smaller than the sum of its proper divisors (21356113362).

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

21323216958 is a wasteful number, since it uses less digits than its factorization.

21323216958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741371.

The product of its digits is 155520, while the sum is 42.

The spelling of 21323216958 in words is "twenty-one billion, three hundred twenty-three million, two hundred sixteen thousand, nine hundred fifty-eight".