21612566541412 has 96 divisors (see below), whose sum is σ = 49222730833920. Its totient is φ = 8057291616000.

The previous prime is 21612566541389. The next prime is 21612566541431. The reversal of 21612566541412 is 21414566521612.

It is a super-2 number, since 2×21612566541412² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11866914 + ... + 13566457.

It is an arithmetic number, because the mean of its divisors is an integer number (512736779520).

Almost surely, 2^{21612566541412} is an apocalyptic number.

21612566541412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21612566541412 is an abundant number, since it is smaller than the sum of its proper divisors (27610164292508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21612566541412 is a wasteful number, since it uses less digits than its factorization.

21612566541412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25433513 (or 25433511 counting only the distinct ones).

The product of its digits is 691200, while the sum is 46.

The spelling of 21612566541412 in words is "twenty-one trillion, six hundred twelve billion, five hundred sixty-six million, five hundred forty-one thousand, four hundred twelve".