21194262711861 has 8 divisors (see below), whose sum is σ = 29170598141184. Its totient is φ = 13673717878560.

The previous prime is 21194262711821. The next prime is 21194262711889. The reversal of 21194262711861 is 16811726249112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21194262711861 - 2⁷ = 21194262711733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21194262711821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113947648896 + ... + 113947649081.

It is an arithmetic number, because the mean of its divisors is an integer number (3646324767648).

Almost surely, 2^{21194262711861} is an apocalyptic number.

It is an amenable number.

21194262711861 is a deficient number, since it is larger than the sum of its proper divisors (7976335429323).

21194262711861 is a wasteful number, since it uses less digits than its factorization.

21194262711861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227895298011.

The product of its digits is 580608, while the sum is 51.

The spelling of 21194262711861 in words is "twenty-one trillion, one hundred ninety-four billion, two hundred sixty-two million, seven hundred eleven thousand, eight hundred sixty-one".