21532583213 has 4 divisors (see below), whose sum is σ = 21853965120. Its totient is φ = 21211201308.

The previous prime is 21532583209. The next prime is 21532583249. The reversal of 21532583213 is 31238523512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21532583213 - 2² = 21532583209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532583203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160690853 + ... + 160690986.

It is an arithmetic number, because the mean of its divisors is an integer number (5463491280).

Almost surely, 2^21532583213 is an apocalyptic number.

It is an amenable number.

21532583213 is a deficient number, since it is larger than the sum of its proper divisors (321381907).

21532583213 is an equidigital number, since it uses as much as digits as its factorization.

21532583213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321381906.

The product of its digits is 43200, while the sum is 35.

The spelling of 21532583213 in words is "twenty-one billion, five hundred thirty-two million, five hundred eighty-three thousand, two hundred thirteen".