213042987 has 20 divisors (see below), whose sum is σ = 321688840. Its totient is φ = 139348872.

The previous prime is 213042983. The next prime is 213043001. The reversal of 213042987 is 789240312.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 213042987 - 2² = 213042983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213042983) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4019653 + ... + 4019705.

It is an arithmetic number, because the mean of its divisors is an integer number (16084442).

Almost surely, 2^213042987 is an apocalyptic number.

213042987 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

213042987 is a deficient number, since it is larger than the sum of its proper divisors (108645853).

213042987 is an frugal number, since it uses more digits than its factorization.

213042987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 56 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 213042987 is about 14595.9921553829. The cubic root of 213042987 is about 597.2494349212.

The spelling of 213042987 in words is "two hundred thirteen million, forty-two thousand, nine hundred eighty-seven".