21101000124 has 24 divisors (see below), whose sum is σ = 51376348800. Its totient is φ = 6727855024.

The previous prime is 21101000057. The next prime is 21101000131. The reversal of 21101000124 is 42100010112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38226174 + ... + 38226725.

It is an arithmetic number, because the mean of its divisors is an integer number (2140681200).

Almost surely, 2^21101000124 is an apocalyptic number.

It is an amenable number.

21101000124 is an abundant number, since it is smaller than the sum of its proper divisors (30275348676).

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

21101000124 is a wasteful number, since it uses less digits than its factorization.

21101000124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76452929 (or 76452927 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21101000124 its reverse (42100010112), we get a palindrome (63201010236).

The spelling of 21101000124 in words is "twenty-one billion, one hundred one million, one hundred twenty-four", and thus it is an aban number.