21312211213 has 8 divisors (see below), whose sum is σ = 22441161600. Its totient is φ = 20183986368.

The previous prime is 21312211201. The next prime is 21312211231. The reversal of 21312211213 is 31211221312.

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

It is not a de Polignac number, because 21312211213 - 2⁵ = 21312211181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312211253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120556 + ... + 239077.

It is an arithmetic number, because the mean of its divisors is an integer number (2805145200).

Almost surely, 2^21312211213 is an apocalyptic number.

It is an amenable number.

21312211213 is a deficient number, since it is larger than the sum of its proper divisors (1128950387).

21312211213 is a wasteful number, since it uses less digits than its factorization.

21312211213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362771.

The product of its digits is 144, while the sum is 19.

Adding to 21312211213 its reverse (31211221312), we get a palindrome (52523432525).

The spelling of 21312211213 in words is "twenty-one billion, three hundred twelve million, two hundred eleven thousand, two hundred thirteen".