21022078773 has 24 divisors (see below), whose sum is σ = 29975234400. Its totient is φ = 13101717760.

The previous prime is 21022078769. The next prime is 21022078811. The reversal of 21022078773 is 37787022012.

It is not a de Polignac number, because 21022078773 - 2² = 21022078769 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022078703) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47818 + ... + 210548.

It is an arithmetic number, because the mean of its divisors is an integer number (1248968100).

Almost surely, 2^21022078773 is an apocalyptic number.

It is an amenable number.

21022078773 is a deficient number, since it is larger than the sum of its proper divisors (8953155627).

21022078773 is a wasteful number, since it uses less digits than its factorization.

21022078773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162917 (or 162900 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 39.

The spelling of 21022078773 in words is "twenty-one billion, twenty-two million, seventy-eight thousand, seven hundred seventy-three".