21102211011020 has 72 divisors (see below), whose sum is σ = 47099102833104. Its totient is φ = 7940247727104.

The previous prime is 21102211011001. The next prime is 21102211011041. The reversal of 21102211011020 is 2011011220112.

It is a super-2 number, since 2×21102211011020² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21102211010986 and 21102211011004.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10228379 + ... + 12117101.

Almost surely, 2^{21102211011020} is an apocalyptic number.

21102211011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102211011020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23549551416552).

21102211011020 is an abundant number, since it is smaller than the sum of its proper divisors (25996891822084).

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

21102211011020 is a wasteful number, since it uses less digits than its factorization.

21102211011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890699 (or 1890680 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21102211011020 its reverse (2011011220112), we get a palindrome (23113222231132).

The spelling of 21102211011020 in words is "twenty-one trillion, one hundred two billion, two hundred eleven million, eleven thousand, twenty".