21601557223463 has 8 divisors (see below), whose sum is σ = 24790788925440. Its totient is φ = 18438149260440.

The previous prime is 21601557223459. The next prime is 21601557223471. The reversal of 21601557223463 is 36432275510612.

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 21601557223463 - 2² = 21601557223459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21601557223423) 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, 6455932943 + ... + 6455936288.

It is an arithmetic number, because the mean of its divisors is an integer number (3098848615680).

Almost surely, 2^{21601557223463} is an apocalyptic number.

21601557223463 is a deficient number, since it is larger than the sum of its proper divisors (3189231701977).

21601557223463 is a wasteful number, since it uses less digits than its factorization.

21601557223463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12911869477.

The product of its (nonzero) digits is 1814400, while the sum is 47.

The spelling of 21601557223463 in words is "twenty-one trillion, six hundred one billion, five hundred fifty-seven million, two hundred twenty-three thousand, four hundred sixty-three".