21265152420610 has 32 divisors (see below), whose sum is σ = 44272510111872. Its totient is φ = 7203067117440.

The previous prime is 21265152420571. The next prime is 21265152420647. The reversal of 21265152420610 is 1602425156212.

It is a self number, because there is not a number n which added to its sum of digits gives 21265152420610.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1830041731 + ... + 1830053350.

It is an arithmetic number, because the mean of its divisors is an integer number (1383515940996).

Almost surely, 2^{21265152420610} is an apocalyptic number.

21265152420610 is an abundant number, since it is smaller than the sum of its proper divisors (23007357691262).

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

21265152420610 is a wasteful number, since it uses less digits than its factorization.

21265152420610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3660095178.

The product of its (nonzero) digits is 57600, while the sum is 37.

Adding to 21265152420610 its reverse (1602425156212), we get a palindrome (22867577576822).

The spelling of 21265152420610 in words is "twenty-one trillion, two hundred sixty-five billion, one hundred fifty-two million, four hundred twenty thousand, six hundred ten".