21461244365 has 8 divisors (see below), whose sum is σ = 28094719968. Its totient is φ = 15608177680.

The previous prime is 21461244349. The next prime is 21461244373. The reversal of 21461244365 is 56344216412.

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

It is not a de Polignac number, because 21461244365 - 2⁴ = 21461244349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195102167 + ... + 195102276.

It is an arithmetic number, because the mean of its divisors is an integer number (3511839996).

Almost surely, 2^21461244365 is an apocalyptic number.

It is an amenable number.

21461244365 is a deficient number, since it is larger than the sum of its proper divisors (6633475603).

21461244365 is a wasteful number, since it uses less digits than its factorization.

21461244365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390204459.

The product of its digits is 138240, while the sum is 38.

The spelling of 21461244365 in words is "twenty-one billion, four hundred sixty-one million, two hundred forty-four thousand, three hundred sixty-five".