21531533020014 has 16 divisors (see below), whose sum is σ = 43063112092752. Its totient is φ = 7177169997888.

The previous prime is 21531533019961. The next prime is 21531533020069. The reversal of 21531533020014 is 41002033513512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8566762 + ... + 10791314.

It is an arithmetic number, because the mean of its divisors is an integer number (2691444505797).

Almost surely, 2^{21531533020014} is an apocalyptic number.

21531533020014 is an abundant number, since it is smaller than the sum of its proper divisors (21531579072738).

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

21531533020014 is a wasteful number, since it uses less digits than its factorization.

21531533020014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3837731.

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 21531533020014 its reverse (41002033513512), we get a palindrome (62533566533526).

The spelling of 21531533020014 in words is "twenty-one trillion, five hundred thirty-one billion, five hundred thirty-three million, twenty thousand, fourteen".