21200101111220 has 24 divisors (see below), whose sum is σ = 44566062232608. Its totient is φ = 8471307130400.

The previous prime is 21200101111181. The next prime is 21200101111249. The reversal of 21200101111220 is 2211110100212.

It is a junction number, because it is equal to n+sod(n) for n = 21200101111195 and 21200101111204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545812226 + ... + 545851065.

It is an arithmetic number, because the mean of its divisors is an integer number (1856919259692).

Almost surely, 2^{21200101111220} is an apocalyptic number.

21200101111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200101111220 is an abundant number, since it is smaller than the sum of its proper divisors (23365961121388).

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

21200101111220 is a wasteful number, since it uses less digits than its factorization.

21200101111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091664271 (or 1091664269 counting only the distinct ones).

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

Adding to 21200101111220 its reverse (2211110100212), we get a palindrome (23411211211432).

The spelling of 21200101111220 in words is "twenty-one trillion, two hundred billion, one hundred one million, one hundred eleven thousand, two hundred twenty".