21620614646467 has 8 divisors (see below), whose sum is σ = 22287501896400. Its totient is φ = 20958071939424.

The previous prime is 21620614646431. The next prime is 21620614646471. The reversal of 21620614646467 is 76464641602612.

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 21620614646467 - 2¹⁹ = 21620614122179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21620614646767) 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, 1086125617 + ... + 1086145522.

It is an arithmetic number, because the mean of its divisors is an integer number (2785937737050).

Almost surely, 2^{21620614646467} is an apocalyptic number.

21620614646467 is a deficient number, since it is larger than the sum of its proper divisors (666887249933).

21620614646467 is a wasteful number, since it uses less digits than its factorization.

21620614646467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2172271445.

The product of its (nonzero) digits is 13934592, while the sum is 55.

The spelling of 21620614646467 in words is "twenty-one trillion, six hundred twenty billion, six hundred fourteen million, six hundred forty-six thousand, four hundred sixty-seven".