21123464543416 has 32 divisors (see below), whose sum is σ = 42510759647040. Its totient is φ = 9804283296768.

The previous prime is 21123464543411. The next prime is 21123464543429. The reversal of 21123464543416 is 61434546432112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123464543411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1063822896 + ... + 1063842751.

It is an arithmetic number, because the mean of its divisors is an integer number (1328461238970).

Almost surely, 2^{21123464543416} is an apocalyptic number.

It is an amenable number.

21123464543416 is an abundant number, since it is smaller than the sum of its proper divisors (21387295103624).

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

21123464543416 is a wasteful number, since it uses less digits than its factorization.

21123464543416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127665743 (or 2127665739 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 46.

The spelling of 21123464543416 in words is "twenty-one trillion, one hundred twenty-three billion, four hundred sixty-four million, five hundred forty-three thousand, four hundred sixteen".