12215494621 has 6 divisors (see below), whose sum is σ = 13426948766. Its totient is φ = 11104995000.

The previous prime is 12215494583. The next prime is 12215494631. The reversal of 12215494621 is 12649451221.

It can be written as a sum of positive squares in only one way, i.e., 11981710521 + 233784100 = 109461^2 + 15290^2 .

It is not a de Polignac number, because 12215494621 - 2³¹ = 10068010973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215494631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50477130 + ... + 50477371.

Almost surely, 2^12215494621 is an apocalyptic number.

12215494621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12215494621 is a deficient number, since it is larger than the sum of its proper divisors (1211454145).

12215494621 is a wasteful number, since it uses less digits than its factorization.

12215494621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100954523 (or 100954512 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The spelling of 12215494621 in words is "twelve billion, two hundred fifteen million, four hundred ninety-four thousand, six hundred twenty-one".