12221851631 has 16 divisors (see below), whose sum is σ = 14059992960. Its totient is φ = 10506998880.

The previous prime is 12221851597. The next prime is 12221851639. The reversal of 12221851631 is 13615812221.

It is a cyclic number.

It is not a de Polignac number, because 12221851631 - 2⁶ = 12221851567 is a prime.

It is a super-2 number, since 2×12221851631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221851639) 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, 63920 + ... + 168906.

It is an arithmetic number, because the mean of its divisors is an integer number (878749560).

Almost surely, 2^12221851631 is an apocalyptic number.

12221851631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12221851631 is a deficient number, since it is larger than the sum of its proper divisors (1838141329).

12221851631 is a wasteful number, since it uses less digits than its factorization.

12221851631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105574.

The product of its digits is 5760, while the sum is 32.

The spelling of 12221851631 in words is "twelve billion, two hundred twenty-one million, eight hundred fifty-one thousand, six hundred thirty-one".