21201010111020 has 96 divisors (see below), whose sum is σ = 59396265061056. Its totient is φ = 5650419174400.

The previous prime is 21201010111013. The next prime is 21201010111049. The reversal of 21201010111020 is 2011101010212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21201010110987 and 21201010111005.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1058928610 + ... + 1058948630.

It is an arithmetic number, because the mean of its divisors is an integer number (618711094386).

Almost surely, 2^{21201010111020} is an apocalyptic number.

21201010111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201010111020 is an abundant number, since it is smaller than the sum of its proper divisors (38195254950036).

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

21201010111020 is a wasteful number, since it uses less digits than its factorization.

21201010111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29091 (or 29089 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21201010111020 its reverse (2011101010212), we get a palindrome (23212111121232).

The spelling of 21201010111020 in words is "twenty-one trillion, two hundred one billion, ten million, one hundred eleven thousand, twenty".