213436473987 has 32 divisors (see below), whose sum is σ = 319676866560. Its totient is φ = 125530456320.

The previous prime is 213436473983. The next prime is 213436474003. The reversal of 213436473987 is 789374634312.

It is not a de Polignac number, because 213436473987 - 2² = 213436473983 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (213436473983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 239439 + ... + 695847.

It is an arithmetic number, because the mean of its divisors is an integer number (9989902080).

Almost surely, 2^213436473987 is an apocalyptic number.

213436473987 is a deficient number, since it is larger than the sum of its proper divisors (106240392573).

213436473987 is a wasteful number, since it uses less digits than its factorization.

213436473987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456843.

The product of its digits is 18289152, while the sum is 57.

The spelling of 213436473987 in words is "two hundred thirteen billion, four hundred thirty-six million, four hundred seventy-three thousand, nine hundred eighty-seven".