21042813100 has 36 divisors (see below), whose sum is σ = 45707418288. Its totient is φ = 8408920000.

The previous prime is 21042813041. The next prime is 21042813107. The reversal of 21042813100 is 131824012.

It is a happy number.

It is a super-2 number, since 2×21042813100² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21042813107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1050 + ... + 205150.

It is an arithmetic number, because the mean of its divisors is an integer number (1269650508).

Almost surely, 2^21042813100 is an apocalyptic number.

21042813100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21042813100 is an abundant number, since it is smaller than the sum of its proper divisors (24664605188).

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

21042813100 is a wasteful number, since it uses less digits than its factorization.

21042813100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205146 (or 205139 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The spelling of 21042813100 in words is "twenty-one billion, forty-two million, eight hundred thirteen thousand, one hundred".