20621256242523 has 16 divisors (see below), whose sum is σ = 27693083443200. Its totient is φ = 13648468525920.

The previous prime is 20621256242467. The next prime is 20621256242593. The reversal of 20621256242523 is 32524265212602.

It is not a de Polignac number, because 20621256242523 - 2⁹ = 20621256242011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20621256242593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61963293 + ... + 62295201.

It is an arithmetic number, because the mean of its divisors is an integer number (1730817715200).

Almost surely, 2^{20621256242523} is an apocalyptic number.

20621256242523 is a deficient number, since it is larger than the sum of its proper divisors (7071827200677).

20621256242523 is a wasteful number, since it uses less digits than its factorization.

20621256242523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481042.

The product of its (nonzero) digits is 691200, while the sum is 42.

The spelling of 20621256242523 in words is "twenty trillion, six hundred twenty-one billion, two hundred fifty-six million, two hundred forty-two thousand, five hundred twenty-three".