21554232121631 has 8 divisors (see below), whose sum is σ = 23513743099728. Its totient is φ = 19594727032000.

The previous prime is 21554232121619. The next prime is 21554232121651. The reversal of 21554232121631 is 13612123245512.

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 21554232121631 - 2²⁶ = 21554165012767 is a prime.

It is a super-2 number, since 2×21554232121631² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554232121651) 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, 10216961 + ... + 12144741.

It is an arithmetic number, because the mean of its divisors is an integer number (2939217887466).

Almost surely, 2^{21554232121631} is an apocalyptic number.

21554232121631 is a deficient number, since it is larger than the sum of its proper divisors (1959510978097).

21554232121631 is a wasteful number, since it uses less digits than its factorization.

21554232121631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2944233.

The product of its digits is 86400, while the sum is 38.

The spelling of 21554232121631 in words is "twenty-one trillion, five hundred fifty-four billion, two hundred thirty-two million, one hundred twenty-one thousand, six hundred thirty-one".