21200011102020 has 48 divisors (see below), whose sum is σ = 59947754182848. Its totient is φ = 5597362665600.

The previous prime is 21200011102009. The next prime is 21200011102031. The reversal of 21200011102020 is 2020111000212.

It is an interprime number because it is at equal distance from previous prime (21200011102009) and next prime (21200011102031).

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 = 21200011101987 and 21200011102005.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1749169774 + ... + 1749181893.

It is an arithmetic number, because the mean of its divisors is an integer number (1248911545476).

Almost surely, 2^{21200011102020} is an apocalyptic number.

21200011102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200011102020 is an abundant number, since it is smaller than the sum of its proper divisors (38747743080828).

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

21200011102020 is a wasteful number, since it uses less digits than its factorization.

21200011102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3498351780 (or 3498351778 counting only the distinct ones).

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

Adding to 21200011102020 its reverse (2020111000212), we get a palindrome (23220122102232).

The spelling of 21200011102020 in words is "twenty-one trillion, two hundred billion, eleven million, one hundred two thousand, twenty".