21368884698 has 64 divisors (see below), whose sum is σ = 57126528000. Its totient is φ = 5784057072.

The previous prime is 21368884657. The next prime is 21368884699. The reversal of 21368884698 is 89648886312.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (21368884699) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1480488 + ... + 1494851.

It is an arithmetic number, because the mean of its divisors is an integer number (892602000).

Almost surely, 2^21368884698 is an apocalyptic number.

21368884698 is an abundant number, since it is smaller than the sum of its proper divisors (35757643302).

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

21368884698 is a wasteful number, since it uses less digits than its factorization.

21368884698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2975376 (or 2975370 counting only the distinct ones).

The product of its digits is 31850496, while the sum is 63.

Adding to 21368884698 its sum of digits (63), we get a square (21368884761 = 146181²).

The spelling of 21368884698 in words is "twenty-one billion, three hundred sixty-eight million, eight hundred eighty-four thousand, six hundred ninety-eight".