12212312021 has 16 divisors (see below), whose sum is σ = 15199430400. Its totient is φ = 9553915008.

The previous prime is 12212312017. The next prime is 12212312041. The reversal of 12212312021 is 12021321221.

It is a cyclic number.

It is not a de Polignac number, because 12212312021 - 2² = 12212312017 is a prime.

It is a super-2 number, since 2×12212312021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212312041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 745841 + ... + 762038.

It is an arithmetic number, because the mean of its divisors is an integer number (949964400).

Almost surely, 2^12212312021 is an apocalyptic number.

It is an amenable number.

12212312021 is a deficient number, since it is larger than the sum of its proper divisors (2987118379).

12212312021 is a wasteful number, since it uses less digits than its factorization.

12212312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507988.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12212312021 its reverse (12021321221), we get a palindrome (24233633242).

The spelling of 12212312021 in words is "twelve billion, two hundred twelve million, three hundred twelve thousand, twenty-one".