21022112078 has 16 divisors (see below), whose sum is σ = 34662418560. Its totient is φ = 9482561400.

The previous prime is 21022112077. The next prime is 21022112101. The reversal of 21022112078 is 87021122012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022112077) 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, 3644258 + ... + 3650021.

It is an arithmetic number, because the mean of its divisors is an integer number (2166401160).

Almost surely, 2^21022112078 is an apocalyptic number.

21022112078 is a deficient number, since it is larger than the sum of its proper divisors (13640306482).

21022112078 is a wasteful number, since it uses less digits than its factorization.

21022112078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7294423.

The product of its (nonzero) digits is 896, while the sum is 26.

The spelling of 21022112078 in words is "twenty-one billion, twenty-two million, one hundred twelve thousand, seventy-eight".