21977697498 has 16 divisors (see below), whose sum is σ = 44032381536. Its totient is φ = 7313068080.

The previous prime is 21977697491. The next prime is 21977697517. The reversal of 21977697498 is 89479677912.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21977697491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3204061 + ... + 3210912.

It is an arithmetic number, because the mean of its divisors is an integer number (2752023846).

Almost surely, 2^21977697498 is an apocalyptic number.

21977697498 is an abundant number, since it is smaller than the sum of its proper divisors (22054684038).

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

21977697498 is a wasteful number, since it uses less digits than its factorization.

21977697498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6415549.

The product of its digits is 96018048, while the sum is 69.

The spelling of 21977697498 in words is "twenty-one billion, nine hundred seventy-seven million, six hundred ninety-seven thousand, four hundred ninety-eight".