21213332231 has 8 divisors (see below), whose sum is σ = 26108716704. Its totient is φ = 16784174880.

The previous prime is 21213332221. The next prime is 21213332291. The reversal of 21213332231 is 13223331212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21213332231 - 2⁶ = 21213332167 is a prime.

It is a super-2 number, since 2×21213332231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21213332197 and 21213332206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213332221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116556680 + ... + 116556861.

It is an arithmetic number, because the mean of its divisors is an integer number (3263589588).

Almost surely, 2^21213332231 is an apocalyptic number.

21213332231 is a deficient number, since it is larger than the sum of its proper divisors (4895384473).

21213332231 is a wasteful number, since it uses less digits than its factorization.

21213332231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233113561.

The product of its digits is 1296, while the sum is 23.

Adding to 21213332231 its reverse (13223331212), we get a palindrome (34436663443).

The spelling of 21213332231 in words is "twenty-one billion, two hundred thirteen million, three hundred thirty-two thousand, two hundred thirty-one".