21192330981 has 16 divisors (see below), whose sum is σ = 28319883840. Its totient is φ = 14096530560.

The previous prime is 21192330923. The next prime is 21192330997. The reversal of 21192330981 is 18903329112.

It is not a de Polignac number, because 21192330981 - 2²¹ = 21190233829 is a prime.

It is a super-2 number, since 2×21192330981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21192330911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4419121 + ... + 4423913.

It is an arithmetic number, because the mean of its divisors is an integer number (1769992740).

Almost surely, 2^21192330981 is an apocalyptic number.

It is an amenable number.

21192330981 is a deficient number, since it is larger than the sum of its proper divisors (7127552859).

21192330981 is a wasteful number, since it uses less digits than its factorization.

21192330981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7796.

The product of its (nonzero) digits is 23328, while the sum is 39.

The spelling of 21192330981 in words is "twenty-one billion, one hundred ninety-two million, three hundred thirty thousand, nine hundred eighty-one".