213311129991 has 4 divisors (see below), whose sum is σ = 284414839992. Its totient is φ = 142207419992.

The previous prime is 213311129987. The next prime is 213311130013. The reversal of 213311129991 is 199921113312.

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 213311129991 - 2² = 213311129987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213311129971) 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, 35551854996 + ... + 35551855001.

It is an arithmetic number, because the mean of its divisors is an integer number (71103709998).

Almost surely, 2^213311129991 is an apocalyptic number.

213311129991 is a deficient number, since it is larger than the sum of its proper divisors (71103710001).

213311129991 is an equidigital number, since it uses as much as digits as its factorization.

213311129991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71103710000.

The product of its digits is 26244, while the sum is 42.

The spelling of 213311129991 in words is "two hundred thirteen billion, three hundred eleven million, one hundred twenty-nine thousand, nine hundred ninety-one".