21011021222200 has 48 divisors (see below), whose sum is σ = 48851950005000. Its totient is φ = 8404180417920.

The previous prime is 21011021222171. The next prime is 21011021222227. The reversal of 21011021222200 is 222212011012.

It is a happy number.

It is a congruent number.

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, 6061026 + ... + 8874574.

Almost surely, 2^{21011021222200} is an apocalyptic number.

21011021222200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011021222200 is an abundant number, since it is smaller than the sum of its proper divisors (27840928782800).

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

21011021222200 is a wasteful number, since it uses less digits than its factorization.

21011021222200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2850904 (or 2850895 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21011021222200 its reverse (222212011012), we get a palindrome (21233233233212).

The spelling of 21011021222200 in words is "twenty-one trillion, eleven billion, twenty-one million, two hundred twenty-two thousand, two hundred".