21200011221000 has 64 divisors (see below), whose sum is σ = 66144035018880. Its totient is φ = 5653336324800.

The previous prime is 21200011220963. The next prime is 21200011221017. The reversal of 21200011221000 is 12211000212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3533332204 + ... + 3533338203.

It is an arithmetic number, because the mean of its divisors is an integer number (1033500547170).

Almost surely, 2^{21200011221000} is an apocalyptic number.

21200011221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200011221000 is an abundant number, since it is smaller than the sum of its proper divisors (44944023797880).

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

21200011221000 is a wasteful number, since it uses less digits than its factorization.

21200011221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7066670431 (or 7066670417 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21200011221000 its reverse (12211000212), we get a palindrome (21212222221212).

The spelling of 21200011221000 in words is "twenty-one trillion, two hundred billion, eleven million, two hundred twenty-one thousand".