21011222195 has 4 divisors (see below), whose sum is σ = 25213466640. Its totient is φ = 16808977752.

The previous prime is 21011222189. The next prime is 21011222201. The reversal of 21011222195 is 59122211012.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21011222189) and next prime (21011222201).

It is a cyclic number.

It is not a de Polignac number, because 21011222195 - 2²⁴ = 20994444979 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2101122215 + ... + 2101122224.

It is an arithmetic number, because the mean of its divisors is an integer number (6303366660).

Almost surely, 2^21011222195 is an apocalyptic number.

21011222195 is a deficient number, since it is larger than the sum of its proper divisors (4202244445).

21011222195 is an equidigital number, since it uses as much as digits as its factorization.

21011222195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4202244444.

The product of its (nonzero) digits is 720, while the sum is 26.

The spelling of 21011222195 in words is "twenty-one billion, eleven million, two hundred twenty-two thousand, one hundred ninety-five".