213711187643 has 4 divisors (see below), whose sum is σ = 213712670688. Its totient is φ = 213709704600.

The previous prime is 213711187637. The next prime is 213711187681. The reversal of 213711187643 is 346781117312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213711187643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213711187594 and 213711187603.

It is not an unprimeable number, because it can be changed into a prime (213711183643) 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, 498908 + ... + 822393.

It is an arithmetic number, because the mean of its divisors is an integer number (53428167672).

Almost surely, 2^213711187643 is an apocalyptic number.

213711187643 is a deficient number, since it is larger than the sum of its proper divisors (1483045).

213711187643 is a wasteful number, since it uses less digits than its factorization.

213711187643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483044.

The product of its digits is 169344, while the sum is 44.

The spelling of 213711187643 in words is "two hundred thirteen billion, seven hundred eleven million, one hundred eighty-seven thousand, six hundred forty-three".