221121000021000 has 128 divisors (see below), whose sum is σ = 690226218864000. Its totient is φ = 58937506092800.

The previous prime is 221121000020993. The next prime is 221121000021001. The reversal of 221121000021000 is 120000121122.

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

It is not an unprimeable number, because it can be changed into a prime (221121000021001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11260647 + ... + 23854646.

It is an arithmetic number, because the mean of its divisors is an integer number (5392392334875).

Almost surely, 2^{221121000021000} is an apocalyptic number.

221121000021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121000021000 is an abundant number, since it is smaller than the sum of its proper divisors (469105218843000).

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

221121000021000 is a wasteful number, since it uses less digits than its factorization.

221121000021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35117416 (or 35117402 counting only the distinct ones).

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

Adding to 221121000021000 its reverse (120000121122), we get a palindrome (221241000142122).

The spelling of 221121000021000 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, twenty-one thousand".