21025243102 has 16 divisors (see below), whose sum is σ = 33400724112. Its totient is φ = 9891953280.

The previous prime is 21025243097. The next prime is 21025243111. The reversal of 21025243102 is 20134252012.

It is a happy number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 83452 + ... + 221392.

It is an arithmetic number, because the mean of its divisors is an integer number (2087545257).

Almost surely, 2^21025243102 is an apocalyptic number.

21025243102 is a deficient number, since it is larger than the sum of its proper divisors (12375481010).

21025243102 is a wasteful number, since it uses less digits than its factorization.

21025243102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142443.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21025243102 its reverse (20134252012), we get a palindrome (41159495114).

The spelling of 21025243102 in words is "twenty-one billion, twenty-five million, two hundred forty-three thousand, one hundred two".