21240030264 has 64 divisors (see below), whose sum is σ = 55564302240. Its totient is φ = 6758668800.

The previous prime is 21240030233. The next prime is 21240030281. The reversal of 21240030264 is 46203004212.

It is a super-2 number, since 2×21240030264² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178587 + ... + 272714.

Almost surely, 2^21240030264 is an apocalyptic number.

21240030264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21240030264 is an abundant number, since it is smaller than the sum of its proper divisors (34324271976).

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

21240030264 is a wasteful number, since it uses less digits than its factorization.

21240030264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451400 (or 451396 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21240030264 its reverse (46203004212), we get a palindrome (67443034476).

The spelling of 21240030264 in words is "twenty-one billion, two hundred forty million, thirty thousand, two hundred sixty-four".