20013725151021 has 48 divisors (see below), whose sum is σ = 31420189592064. Its totient is φ = 11297008882656.

The previous prime is 20013725150983. The next prime is 20013725151031. The reversal of 20013725151021 is 12015152731002.

It is not a de Polignac number, because 20013725151021 - 2⁶ = 20013725150957 is a prime.

It is a super-2 number, since 2×20013725151021² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20013725151021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013725151031) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87818806 + ... + 88046408.

It is an arithmetic number, because the mean of its divisors is an integer number (654587283168).

Almost surely, 2^{20013725151021} is an apocalyptic number.

20013725151021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20013725151021 is a deficient number, since it is larger than the sum of its proper divisors (11406464441043).

20013725151021 is a wasteful number, since it uses less digits than its factorization.

20013725151021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234910 (or 234903 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

Adding to 20013725151021 its reverse (12015152731002), we get a palindrome (32028877882023).

The spelling of 20013725151021 in words is "twenty trillion, thirteen billion, seven hundred twenty-five million, one hundred fifty-one thousand, twenty-one".