21240313352 has 16 divisors (see below), whose sum is σ = 39886030800. Its totient is φ = 10604038480.

The previous prime is 21240313333. The next prime is 21240313363. The reversal of 21240313352 is 25331304212.

It is a happy number.

It is a super-2 number, since 2×21240313352² (a number of 21 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, 2009174 + ... + 2019717.

It is an arithmetic number, because the mean of its divisors is an integer number (2492876925).

Almost surely, 2^21240313352 is an apocalyptic number.

It is an amenable number.

21240313352 is a deficient number, since it is larger than the sum of its proper divisors (18645717448).

21240313352 is a wasteful number, since it uses less digits than its factorization.

21240313352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4029556 (or 4029552 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21240313352 its reverse (25331304212), we get a palindrome (46571617564).

The spelling of 21240313352 in words is "twenty-one billion, two hundred forty million, three hundred thirteen thousand, three hundred fifty-two".