21650497100 has 36 divisors (see below), whose sum is σ = 47061743064. Its totient is φ = 8645422080.

The previous prime is 21650497091. The next prime is 21650497111. The reversal of 21650497100 is 179405612.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125717 + ... + 243116.

Almost surely, 2^21650497100 is an apocalyptic number.

21650497100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21650497100 is an abundant number, since it is smaller than the sum of its proper divisors (25411245964).

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

21650497100 is a wasteful number, since it uses less digits than its factorization.

21650497100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369434 (or 369427 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 21650497100 in words is "twenty-one billion, six hundred fifty million, four hundred ninety-seven thousand, one hundred".