21354677645312 has 52 divisors (see below), whose sum is σ = 46586336548776. Its totient is φ = 9706671636480.

The previous prime is 21354677645311. The next prime is 21354677645317.

It is a happy number.

21354677645312 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (21354677645311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236934233 + ... + 237024344.

Almost surely, 2^{21354677645312} is an apocalyptic number.

21354677645312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21354677645312 is an abundant number, since it is smaller than the sum of its proper divisors (25231658903464).

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

21354677645312 is an equidigital number, since it uses as much as digits as its factorization.

21354677645312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473958612 (or 473958590 counting only the distinct ones).

The product of its digits is 25401600, while the sum is 56.

The spelling of 21354677645312 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred seventy-seven million, six hundred forty-five thousand, three hundred twelve".