21146543456416 has 24 divisors (see below), whose sum is σ = 47579722777440. Its totient is φ = 9062804338368.

The previous prime is 21146543456369. The next prime is 21146543456443. The reversal of 21146543456416 is 61465434564112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47202105706 + ... + 47202106153.

It is an arithmetic number, because the mean of its divisors is an integer number (1982488449060).

Almost surely, 2^{21146543456416} is an apocalyptic number.

It is an amenable number.

21146543456416 is an abundant number, since it is smaller than the sum of its proper divisors (26433179321024).

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

21146543456416 is an equidigital number, since it uses as much as digits as its factorization.

21146543456416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94404211876 (or 94404211868 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 52.

The spelling of 21146543456416 in words is "twenty-one trillion, one hundred forty-six billion, five hundred forty-three million, four hundred fifty-six thousand, four hundred sixteen".