21202212400 has 30 divisors (see below), whose sum is σ = 50938316252. Its totient is φ = 8480884800.

The previous prime is 21202212397. The next prime is 21202212457. The reversal of 21202212400 is 421220212.

It is a super-3 number, since 3×21202212400³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 26502366 + ... + 26503165.

Almost surely, 2^21202212400 is an apocalyptic number.

21202212400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202212400 is an abundant number, since it is smaller than the sum of its proper divisors (29736103852).

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

21202212400 is a wasteful number, since it uses less digits than its factorization.

21202212400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53005549 (or 53005538 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21202212400 its reverse (421220212), we get a palindrome (21623432612).

It can be divided in two parts, 212022 and 12400, that added together give a palindrome (224422).

The spelling of 21202212400 in words is "twenty-one billion, two hundred two million, two hundred twelve thousand, four hundred".