21531532500213 has 32 divisors (see below), whose sum is σ = 29741795069952. Its totient is φ = 13841163705600.

The previous prime is 21531532500209. The next prime is 21531532500223. The reversal of 21531532500213 is 31200523513512.

It is not a de Polignac number, because 21531532500213 - 2² = 21531532500209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21531532500223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 486379306 + ... + 486423572.

It is an arithmetic number, because the mean of its divisors is an integer number (929431095936).

Almost surely, 2^{21531532500213} is an apocalyptic number.

It is an amenable number.

21531532500213 is a deficient number, since it is larger than the sum of its proper divisors (8210262569739).

21531532500213 is a wasteful number, since it uses less digits than its factorization.

21531532500213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63065.

The product of its (nonzero) digits is 27000, while the sum is 33.

The spelling of 21531532500213 in words is "twenty-one trillion, five hundred thirty-one billion, five hundred thirty-two million, five hundred thousand, two hundred thirteen".