221987870201 has 4 divisors (see below), whose sum is σ = 221990957904. Its totient is φ = 221984782500.

The previous prime is 221987870189. The next prime is 221987870249. The reversal of 221987870201 is 102078789122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221987870201 - 2¹⁴ = 221987853817 is a prime.

It is a super-2 number, since 2×221987870201² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221987870501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1433375 + ... + 1580676.

It is an arithmetic number, because the mean of its divisors is an integer number (55497739476).

Almost surely, 2^221987870201 is an apocalyptic number.

It is an amenable number.

221987870201 is a deficient number, since it is larger than the sum of its proper divisors (3087703).

221987870201 is an equidigital number, since it uses as much as digits as its factorization.

221987870201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3087702.

The product of its (nonzero) digits is 225792, while the sum is 47.

The spelling of 221987870201 in words is "two hundred twenty-one billion, nine hundred eighty-seven million, eight hundred seventy thousand, two hundred one".