21240021402304 has 28 divisors (see below), whose sum is σ = 42192958416048. Its totient is φ = 10608724793600.

The previous prime is 21240021402293. The next prime is 21240021402319. The reversal of 21240021402304 is 40320412004212.

It is a super-2 number, since 2×21240021402304² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176281612 + ... + 176402059.

Almost surely, 2^{21240021402304} is an apocalyptic number.

It is an amenable number.

21240021402304 is a deficient number, since it is larger than the sum of its proper divisors (20952937013744).

21240021402304 is an equidigital number, since it uses as much as digits as its factorization.

21240021402304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352684624 (or 352684614 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21240021402304 its reverse (40320412004212), we get a palindrome (61560433406516).

The spelling of 21240021402304 in words is "twenty-one trillion, two hundred forty billion, twenty-one million, four hundred two thousand, three hundred four".