216011532421 has 4 divisors (see below), whose sum is σ = 216014312992. Its totient is φ = 216008751852.

The previous prime is 216011532409. The next prime is 216011532433. The reversal of 216011532421 is 124235110612.

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 an interprime number because it is at equal distance from previous prime (216011532409) and next prime (216011532433).

It is a cyclic number.

It is not a de Polignac number, because 216011532421 - 2²⁵ = 215977977989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216011532421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216011532221) 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, 1270305 + ... + 1430278.

It is an arithmetic number, because the mean of its divisors is an integer number (54003578248).

Almost surely, 2^216011532421 is an apocalyptic number.

It is an amenable number.

216011532421 is a deficient number, since it is larger than the sum of its proper divisors (2780571).

216011532421 is an equidigital number, since it uses as much as digits as its factorization.

216011532421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2780570.

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 216011532421 in words is "two hundred sixteen billion, eleven million, five hundred thirty-two thousand, four hundred twenty-one".