21152341100 has 36 divisors (see below), whose sum is σ = 50073362808. Its totient is φ = 7691760000.

The previous prime is 21152341097. The next prime is 21152341123. The reversal of 21152341100 is 114325112.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 9613601 + ... + 9615800.

Almost surely, 2^21152341100 is an apocalyptic number.

21152341100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21152341100 is an abundant number, since it is smaller than the sum of its proper divisors (28921021708).

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

21152341100 is a wasteful number, since it uses less digits than its factorization.

21152341100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19229426 (or 19229419 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21152341100 its reverse (114325112), we get a palindrome (21266666212).

The spelling of 21152341100 in words is "twenty-one billion, one hundred fifty-two million, three hundred forty-one thousand, one hundred".