21412103400 has 72 divisors (see below), whose sum is σ = 71908986630. Its totient is φ = 5709893760.

The previous prime is 21412103387. The next prime is 21412103407. The reversal of 21412103400 is 430121412.

It can be written as a sum of positive squares in 3 ways, for example, as 13189603716 + 8222499684 = 114846^2 + 90678^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21412103407) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5946007 + ... + 5949606.

Almost surely, 2^21412103400 is an apocalyptic number.

21412103400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21412103400 is an abundant number, since it is smaller than the sum of its proper divisors (50496883230).

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

21412103400 is a wasteful number, since it uses less digits than its factorization.

21412103400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11895635 (or 11895623 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21412103400 its reverse (430121412), we get a palindrome (21842224812).

The spelling of 21412103400 in words is "twenty-one billion, four hundred twelve million, one hundred three thousand, four hundred".