21101000121020 has 12 divisors (see below), whose sum is σ = 44312100254184. Its totient is φ = 8440400048400.

The previous prime is 21101000120989. The next prime is 21101000121023. The reversal of 21101000121020 is 2012100010112.

It is a super-2 number, since 2×21101000121020² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21101000120992 and 21101000121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101000121023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527525003006 + ... + 527525003045.

It is an arithmetic number, because the mean of its divisors is an integer number (3692675021182).

Almost surely, 2^{21101000121020} is an apocalyptic number.

21101000121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101000121020 is an abundant number, since it is smaller than the sum of its proper divisors (23211100133164).

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

21101000121020 is a wasteful number, since it uses less digits than its factorization.

21101000121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055050006060 (or 1055050006058 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21101000121020 its reverse (2012100010112), we get a palindrome (23113100131132).

The spelling of 21101000121020 in words is "twenty-one trillion, one hundred one billion, one hundred twenty-one thousand, twenty".