12212210021 has 16 divisors (see below), whose sum is σ = 13904872128. Its totient is φ = 10626844800.

The previous prime is 12212209991. The next prime is 12212210041. The reversal of 12212210021 is 12001221221.

It is a de Polignac number, because none of the positive numbers 2^k-12212210021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212209978 and 12212210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212210041) 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, 231551 + ... + 279356.

It is an arithmetic number, because the mean of its divisors is an integer number (869054508).

Almost surely, 2^12212210021 is an apocalyptic number.

12212210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12212210021 is a deficient number, since it is larger than the sum of its proper divisors (1692662107).

12212210021 is a wasteful number, since it uses less digits than its factorization.

12212210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511012.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12212210021 its reverse (12001221221), we get a palindrome (24213431242).

The spelling of 12212210021 in words is "twelve billion, two hundred twelve million, two hundred ten thousand, twenty-one".