21215249058 has 32 divisors (see below), whose sum is σ = 42728136192. Its totient is φ = 7022304000.

The previous prime is 21215249051. The next prime is 21215249129. The reversal of 21215249058 is 85094251212.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21215249051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 516768 + ... + 556308.

It is an arithmetic number, because the mean of its divisors is an integer number (1335254256).

Almost surely, 2^21215249058 is an apocalyptic number.

21215249058 is an abundant number, since it is smaller than the sum of its proper divisors (21512887134).

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

21215249058 is a wasteful number, since it uses less digits than its factorization.

21215249058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40170.

The product of its (nonzero) digits is 57600, while the sum is 39.

The spelling of 21215249058 in words is "twenty-one billion, two hundred fifteen million, two hundred forty-nine thousand, fifty-eight".