21211222212200 has 48 divisors (see below), whose sum is σ = 49387461128160. Its totient is φ = 8472210264000.

The previous prime is 21211222212181. The next prime is 21211222212269. The reversal of 21211222212200 is 221222211212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76602836 + ... + 76879235.

It is an arithmetic number, because the mean of its divisors is an integer number (1028905440170).

Almost surely, 2^{21211222212200} is an apocalyptic number.

21211222212200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211222212200 is an abundant number, since it is smaller than the sum of its proper divisors (28176238915960).

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

21211222212200 is a wasteful number, since it uses less digits than its factorization.

21211222212200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153482778 (or 153482769 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21211222212200 its reverse (221222211212), we get a palindrome (21432444423412).

The spelling of 21211222212200 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred twelve thousand, two hundred".