21382222078 has 24 divisors (see below), whose sum is σ = 37672728912. Its totient is φ = 8916130944.

The previous prime is 21382222049. The next prime is 21382222079. The reversal of 21382222078 is 87022228312.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21382222079) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 538651 + ... + 576982.

It is an arithmetic number, because the mean of its divisors is an integer number (1569697038).

Almost surely, 2^21382222078 is an apocalyptic number.

21382222078 is a deficient number, since it is larger than the sum of its proper divisors (16290506834).

21382222078 is a wasteful number, since it uses less digits than its factorization.

21382222078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115716 (or 1115679 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The spelling of 21382222078 in words is "twenty-one billion, three hundred eighty-two million, two hundred twenty-two thousand, seventy-eight".