21631562173741 has 8 divisors (see below), whose sum is σ = 23623634530944. Its totient is φ = 19686362107440.

The previous prime is 21631562173691. The next prime is 21631562173751. The reversal of 21631562173741 is 14737126513612.

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

It is a cyclic number.

It is not a de Polignac number, because 21631562173741 - 2¹⁵ = 21631562140973 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 (21631562173751) 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, 11718071761 + ... + 11718073606.

It is an arithmetic number, because the mean of its divisors is an integer number (2952954316368).

Almost surely, 2^{21631562173741} is an apocalyptic number.

It is an amenable number.

21631562173741 is a deficient number, since it is larger than the sum of its proper divisors (1992072357203).

21631562173741 is a wasteful number, since it uses less digits than its factorization.

21631562173741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23436145451.

The product of its digits is 1270080, while the sum is 49.

The spelling of 21631562173741 in words is "twenty-one trillion, six hundred thirty-one billion, five hundred sixty-two million, one hundred seventy-three thousand, seven hundred forty-one".