213031661220011 has 4 divisors (see below), whose sum is σ = 213033546118632. Its totient is φ = 213029776321392.

The previous prime is 213031661219921. The next prime is 213031661220013. The reversal of 213031661220011 is 110022166130312.

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-213031661220011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213031661220013) 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, 942279770 + ... + 942505823.

It is an arithmetic number, because the mean of its divisors is an integer number (53258386529658).

Almost surely, 2^{213031661220011} is an apocalyptic number.

213031661220011 is a deficient number, since it is larger than the sum of its proper divisors (1884898621).

213031661220011 is a wasteful number, since it uses less digits than its factorization.

213031661220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884898620.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 213031661220011 in words is "two hundred thirteen trillion, thirty-one billion, six hundred sixty-one million, two hundred twenty thousand, eleven".