122211987 has 4 divisors (see below), whose sum is σ = 162949320. Its totient is φ = 81474656.

The previous prime is 122211983. The next prime is 122211989. The reversal of 122211987 is 789112221.

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

It is a cyclic number.

It is not a de Polignac number, because 122211987 - 2² = 122211983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122211983) 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, 20368662 + ... + 20368667.

It is an arithmetic number, because the mean of its divisors is an integer number (40737330).

Almost surely, 2^122211987 is an apocalyptic number.

122211987 is a deficient number, since it is larger than the sum of its proper divisors (40737333).

122211987 is an equidigital number, since it uses as much as digits as its factorization.

122211987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40737332.

The product of its digits is 4032, while the sum is 33.

The square root of 122211987 is about 11054.9530528175. The cubic root of 122211987 is about 496.2546643049.

The spelling of 122211987 in words is "one hundred twenty-two million, two hundred eleven thousand, nine hundred eighty-seven".