21450006100 has 36 divisors (see below), whose sum is σ = 47184152764. Its totient is φ = 8462465280.

The previous prime is 21450006059. The next prime is 21450006181. The reversal of 21450006100 is 160005412.

It can be written as a sum of positive squares in 6 ways, for example, as 2072252484 + 19377753616 = 45522^2 + 139204^2 .

It is a super-3 number, since 3×21450006100³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

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, 1461879 + ... + 1476478.

Almost surely, 2^21450006100 is an apocalyptic number.

21450006100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21450006100 is an abundant number, since it is smaller than the sum of its proper divisors (25734146664).

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

21450006100 is a wasteful number, since it uses less digits than its factorization.

21450006100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2938444 (or 2938437 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The spelling of 21450006100 in words is "twenty-one billion, four hundred fifty million, six thousand, one hundred".