21506263013102 has 24 divisors (see below), whose sum is σ = 37526609250144. Its totient is φ = 9216877804512.

The previous prime is 21506263013069. The next prime is 21506263013107. The reversal of 21506263013102 is 20131036260512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21506263013107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9263018 + ... + 11349714.

It is an arithmetic number, because the mean of its divisors is an integer number (1563608718756).

Almost surely, 2^{21506263013102} is an apocalyptic number.

21506263013102 is a deficient number, since it is larger than the sum of its proper divisors (16020346237042).

21506263013102 is a wasteful number, since it uses less digits than its factorization.

21506263013102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191880 (or 2191873 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

Adding to 21506263013102 its reverse (20131036260512), we get a palindrome (41637299273614).

The spelling of 21506263013102 in words is "twenty-one trillion, five hundred six billion, two hundred sixty-three million, thirteen thousand, one hundred two".