21222001001000 has 64 divisors (see below), whose sum is σ = 50814354127680. Its totient is φ = 8291386420800.

The previous prime is 21222001000987. The next prime is 21222001001011. The reversal of 21222001001000 is 10010022212.

It is a happy number.

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, 246724454 + ... + 246810453.

It is an arithmetic number, because the mean of its divisors is an integer number (793974283245).

Almost surely, 2^{21222001001000} is an apocalyptic number.

21222001001000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222001001000 is an abundant number, since it is smaller than the sum of its proper divisors (29592353126680).

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

21222001001000 is a wasteful number, since it uses less digits than its factorization.

21222001001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493534971 (or 493534957 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21222001001000 its reverse (10010022212), we get a palindrome (21232011023212).

The spelling of 21222001001000 in words is "twenty-one trillion, two hundred twenty-two billion, one million, one thousand".