20523000121 has 16 divisors (see below), whose sum is σ = 22444098768. Its totient is φ = 18652896000.

The previous prime is 20523000107. The next prime is 20523000131. The reversal of 20523000121 is 12100032502.

It can be written as a sum of positive squares in 8 ways, for example, as 438441721 + 20084558400 = 20939^2 + 141720^2 .

It is a cyclic number.

It is not a de Polignac number, because 20523000121 - 2⁷ = 20522999993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20523000095 and 20523000104.

It is not an unprimeable number, because it can be changed into a prime (20523000131) 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, 194475 + ... + 280831.

It is an arithmetic number, because the mean of its divisors is an integer number (1402756173).

Almost surely, 2^20523000121 is an apocalyptic number.

It is an amenable number.

20523000121 is a deficient number, since it is larger than the sum of its proper divisors (1921098647).

20523000121 is a wasteful number, since it uses less digits than its factorization.

20523000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86652.

The product of its (nonzero) digits is 120, while the sum is 16.

Adding to 20523000121 its reverse (12100032502), we get a palindrome (32623032623).

The spelling of 20523000121 in words is "twenty billion, five hundred twenty-three million, one hundred twenty-one", and thus it is an aban number.