21034213400 has 24 divisors (see below), whose sum is σ = 48904546620. Its totient is φ = 8413685280.

The previous prime is 21034213399. The next prime is 21034213427. The reversal of 21034213400 is 431243012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52585334 + ... + 52585733.

Almost surely, 2^21034213400 is an apocalyptic number.

21034213400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21034213400 is an abundant number, since it is smaller than the sum of its proper divisors (27870333220).

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

21034213400 is a wasteful number, since it uses less digits than its factorization.

21034213400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105171083 (or 105171074 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21034213400 its reverse (431243012), we get a palindrome (21465456412).

The spelling of 21034213400 in words is "twenty-one billion, thirty-four million, two hundred thirteen thousand, four hundred".