21220010011197 has 24 divisors (see below), whose sum is σ = 32307440212320. Its totient is φ = 13914760653360.

The previous prime is 21220010011181. The next prime is 21220010011247. The reversal of 21220010011197 is 79111001002212.

It is not a de Polignac number, because 21220010011197 - 2⁴ = 21220010011181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 21220010011197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220010011397) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 715765047 + ... + 715794692.

It is an arithmetic number, because the mean of its divisors is an integer number (1346143342180).

Almost surely, 2^{21220010011197} is an apocalyptic number.

21220010011197 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21220010011197 is a deficient number, since it is larger than the sum of its proper divisors (11087430201123).

21220010011197 is an equidigital number, since it uses as much as digits as its factorization.

21220010011197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431559815 (or 1431559803 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The spelling of 21220010011197 in words is "twenty-one trillion, two hundred twenty billion, ten million, eleven thousand, one hundred ninety-seven".