21521113014 has 32 divisors (see below), whose sum is σ = 43762700160. Its totient is φ = 7054008192.

The previous prime is 21521112941. The next prime is 21521113049. The reversal of 21521113014 is 41031112512.

It is a super-2 number, since 2×21521113014² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178782 + ... + 273870.

It is an arithmetic number, because the mean of its divisors is an integer number (1367584380).

Almost surely, 2^21521113014 is an apocalyptic number.

21521113014 is an abundant number, since it is smaller than the sum of its proper divisors (22241587146).

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

21521113014 is a wasteful number, since it uses less digits than its factorization.

21521113014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95724.

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 21521113014 its reverse (41031112512), we get a palindrome (62552225526).

The spelling of 21521113014 in words is "twenty-one billion, five hundred twenty-one million, one hundred thirteen thousand, fourteen".