21033213400 has 48 divisors (see below), whose sum is σ = 49019128200. Its totient is φ = 8393172480.

The previous prime is 21033213367. The next prime is 21033213401. The reversal of 21033213400 is 431233012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033213401) 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, 41697 + ... + 209296.

Almost surely, 2^21033213400 is an apocalyptic number.

21033213400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21033213400 is an abundant number, since it is smaller than the sum of its proper divisors (27985914800).

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

21033213400 is a wasteful number, since it uses less digits than its factorization.

21033213400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251428 (or 251419 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21033213400 its reverse (431233012), we get a palindrome (21464446412).

The spelling of 21033213400 in words is "twenty-one billion, thirty-three million, two hundred thirteen thousand, four hundred".