212051987 has 4 divisors (see below), whose sum is σ = 242345136. Its totient is φ = 181758840.

The previous prime is 212051981. The next prime is 212052013. The reversal of 212051987 is 789150212.

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 212051987 - 2⁸ = 212051731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212051981) 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, 15146564 + ... + 15146577.

It is an arithmetic number, because the mean of its divisors is an integer number (60586284).

Almost surely, 2^212051987 is an apocalyptic number.

212051987 is a deficient number, since it is larger than the sum of its proper divisors (30293149).

212051987 is an equidigital number, since it uses as much as digits as its factorization.

212051987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30293148.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 212051987 is about 14562.0049100390. The cubic root of 212051987 is about 596.3219314994.

The spelling of 212051987 in words is "two hundred twelve million, fifty-one thousand, nine hundred eighty-seven".