21012401100 has 36 divisors (see below), whose sum is σ = 60795881384. Its totient is φ = 5603306880.

The previous prime is 21012401089. The next prime is 21012401101. The reversal of 21012401100 is 110421012.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21012401101) 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, 35020369 + ... + 35020968.

Almost surely, 2^21012401100 is an apocalyptic number.

21012401100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012401100 is an abundant number, since it is smaller than the sum of its proper divisors (39783480284).

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

21012401100 is a wasteful number, since it uses less digits than its factorization.

21012401100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70041354 (or 70041347 counting only the distinct ones).

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

Adding to 21012401100 its reverse (110421012), we get a palindrome (21122822112).

The spelling of 21012401100 in words is "twenty-one billion, twelve million, four hundred one thousand, one hundred".