21999576898 has 16 divisors (see below), whose sum is σ = 36068195520. Its totient is φ = 10002103056.

The previous prime is 21999576887. The next prime is 21999576899. The reversal of 21999576898 is 89867599912.

It is a self number, because there is not a number n which added to its sum of digits gives 21999576898.

It is not an unprimeable number, because it can be changed into a prime (21999576899) 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, 6312718 + ... + 6316201.

It is an arithmetic number, because the mean of its divisors is an integer number (2254262220).

Almost surely, 2^21999576898 is an apocalyptic number.

21999576898 is a deficient number, since it is larger than the sum of its proper divisors (14068618622).

21999576898 is a wasteful number, since it uses less digits than its factorization.

21999576898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12629001.

The product of its digits is 176359680, while the sum is 73.

The spelling of 21999576898 in words is "twenty-one billion, nine hundred ninety-nine million, five hundred seventy-six thousand, eight hundred ninety-eight".