20351654532121 has 12 divisors (see below), whose sum is σ = 22591485602532. Its totient is φ = 18318320900000.

The previous prime is 20351654532059. The next prime is 20351654532151. The reversal of 20351654532121 is 12123545615302.

It can be written as a sum of positive squares in 2 ways, for example, as 15468968829721 + 4882685702400 = 3933061^2 + 2209680^2 .

It is not a de Polignac number, because 20351654532121 - 2⁹ = 20351654531609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20351654532151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 832638730 + ... + 832663171.

It is an arithmetic number, because the mean of its divisors is an integer number (1882623800211).

Almost surely, 2^{20351654532121} is an apocalyptic number.

It is an amenable number.

20351654532121 is a deficient number, since it is larger than the sum of its proper divisors (2239831070411).

20351654532121 is a wasteful number, since it uses less digits than its factorization.

20351654532121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665302024 (or 1665302013 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 20351654532121 in words is "twenty trillion, three hundred fifty-one billion, six hundred fifty-four million, five hundred thirty-two thousand, one hundred twenty-one".