213781041987 has 32 divisors (see below), whose sum is σ = 302479200000. Its totient is φ = 133839433728.

The previous prime is 213781041973. The next prime is 213781041997. The reversal of 213781041987 is 789140187312.

It is not a de Polignac number, because 213781041987 - 2⁸ = 213781041731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (213781041997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54715488 + ... + 54719394.

It is an arithmetic number, because the mean of its divisors is an integer number (9452475000).

Almost surely, 2^213781041987 is an apocalyptic number.

213781041987 is a deficient number, since it is larger than the sum of its proper divisors (88698158013).

213781041987 is a wasteful number, since it uses less digits than its factorization.

213781041987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6035.

The product of its (nonzero) digits is 677376, while the sum is 51.

The spelling of 213781041987 in words is "two hundred thirteen billion, seven hundred eighty-one million, forty-one thousand, nine hundred eighty-seven".