21461144505331 has 4 divisors (see below), whose sum is σ = 21812966546464. Its totient is φ = 21109322464200.

The previous prime is 21461144505293. The next prime is 21461144505341. The reversal of 21461144505331 is 13350544116412.

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 21461144505331 - 2²⁵ = 21461110950899 is a prime.

It is a super-2 number, since 2×21461144505331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21461144505341) 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, 175911020475 + ... + 175911020596.

It is an arithmetic number, because the mean of its divisors is an integer number (5453241636616).

Almost surely, 2^{21461144505331} is an apocalyptic number.

21461144505331 is a deficient number, since it is larger than the sum of its proper divisors (351822041133).

21461144505331 is an equidigital number, since it uses as much as digits as its factorization.

21461144505331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351822041132.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 21461144505331 in words is "twenty-one trillion, four hundred sixty-one billion, one hundred forty-four million, five hundred five thousand, three hundred thirty-one".