21112323213400 has 24 divisors (see below), whose sum is σ = 49086151471620. Its totient is φ = 8444929285280.

The previous prime is 21112323213389. The next prime is 21112323213437. The reversal of 21112323213400 is 431232321112.

It is a Harshad number since it is a multiple of its sum of digits (25).

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, 52780807834 + ... + 52780808233.

Almost surely, 2^{21112323213400} is an apocalyptic number.

21112323213400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112323213400 is an abundant number, since it is smaller than the sum of its proper divisors (27973828258220).

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

21112323213400 is a wasteful number, since it uses less digits than its factorization.

21112323213400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105561616083 (or 105561616074 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21112323213400 its reverse (431232321112), we get a palindrome (21543555534512).

The spelling of 21112323213400 in words is "twenty-one trillion, one hundred twelve billion, three hundred twenty-three million, two hundred thirteen thousand, four hundred".