21204025610 has 32 divisors (see below), whose sum is σ = 38308030272. Its totient is φ = 8450386560.

The previous prime is 21204025561. The next prime is 21204025639. The reversal of 21204025610 is 1652040212.

It is a happy number.

It is a super-2 number, since 2×21204025610² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3223625 + ... + 3230195.

It is an arithmetic number, because the mean of its divisors is an integer number (1197125946).

Almost surely, 2^21204025610 is an apocalyptic number.

21204025610 is a deficient number, since it is larger than the sum of its proper divisors (17104004662).

21204025610 is a wasteful number, since it uses less digits than its factorization.

21204025610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7718.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21204025610 its reverse (1652040212), we get a palindrome (22856065822).

The spelling of 21204025610 in words is "twenty-one billion, two hundred four million, twenty-five thousand, six hundred ten".