21621532625465 has 8 divisors (see below), whose sum is σ = 26037520562688. Its totient is φ = 17236105158960.

The previous prime is 21621532625443. The next prime is 21621532625489. The reversal of 21621532625465 is 56452623512612.

It is a happy number.

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

It is not a de Polignac number, because 21621532625465 - 2¹² = 21621532621369 is a prime.

It is a Duffinian 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, 7640116121 + ... + 7640118950.

It is an arithmetic number, because the mean of its divisors is an integer number (3254690070336).

Almost surely, 2^{21621532625465} is an apocalyptic number.

It is an amenable number.

21621532625465 is a deficient number, since it is larger than the sum of its proper divisors (4415987937223).

21621532625465 is a wasteful number, since it uses less digits than its factorization.

21621532625465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15280235359.

The product of its digits is 5184000, while the sum is 50.

The spelling of 21621532625465 in words is "twenty-one trillion, six hundred twenty-one billion, five hundred thirty-two million, six hundred twenty-five thousand, four hundred sixty-five".