21630343264 has 48 divisors (see below), whose sum is σ = 43876159488. Its totient is φ = 10489070592.

The previous prime is 21630343253. The next prime is 21630343297. The reversal of 21630343264 is 46234303612.

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, 341409 + ... + 399775.

It is an arithmetic number, because the mean of its divisors is an integer number (914086656).

Almost surely, 2^21630343264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21630343264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21938079744).

21630343264 is an abundant number, since it is smaller than the sum of its proper divisors (22245816224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21630343264 is a wasteful number, since it uses less digits than its factorization.

21630343264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58727 (or 58719 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 34.

Adding to 21630343264 its reverse (46234303612), we get a palindrome (67864646876).

The spelling of 21630343264 in words is "twenty-one billion, six hundred thirty million, three hundred forty-three thousand, two hundred sixty-four".