21121110199488 has 112 divisors (see below), whose sum is σ = 60183885565440. Its totient is φ = 6498559017984.

The previous prime is 21121110199457. The next prime is 21121110199489. The reversal of 21121110199488 is 88499101112112.

It is a happy number.

It is a super-2 number, since 2×21121110199488² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (21121110199489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73055923 + ... + 73344461.

It is an arithmetic number, because the mean of its divisors is an integer number (537356121120).

Almost surely, 2^{21121110199488} is an apocalyptic number.

It is an amenable number.

21121110199488 is an abundant number, since it is smaller than the sum of its proper divisors (39062775365952).

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

21121110199488 is a wasteful number, since it uses less digits than its factorization.

21121110199488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317894 (or 317884 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 48.

The spelling of 21121110199488 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred ten million, one hundred ninety-nine thousand, four hundred eighty-eight".