31642201621111 has 4 divisors (see below), whose sum is σ = 31642525063800. Its totient is φ = 31641878178424.

The previous prime is 31642201621099. The next prime is 31642201621181. The reversal of 31642201621111 is 11112610224613.

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 31642201621111 - 2⁹ = 31642201620599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31642201621181) 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, 161574556 + ... + 161770273.

It is an arithmetic number, because the mean of its divisors is an integer number (7910631265950).

Almost surely, 2^{31642201621111} is an apocalyptic number.

31642201621111 is a deficient number, since it is larger than the sum of its proper divisors (323442689).

31642201621111 is an equidigital number, since it uses as much as digits as its factorization.

31642201621111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323442688.

The product of its (nonzero) digits is 3456, while the sum is 31.

Adding to 31642201621111 its reverse (11112610224613), we get a palindrome (42754811845724).

The spelling of 31642201621111 in words is "thirty-one trillion, six hundred forty-two billion, two hundred one million, six hundred twenty-one thousand, one hundred eleven".