20253121 has 16 divisors (see below), whose sum is σ = 23846400. Its totient is φ = 17193120.

The previous prime is 20253119. The next prime is 20253127. The reversal of 20253121 is 12135202.

It is not a de Polignac number, because 20253121 - 2¹ = 20253119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20253095 and 20253104.

It is not an unprimeable number, because it can be changed into a prime (20253127) 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, 46776 + ... + 47206.

It is an arithmetic number, because the mean of its divisors is an integer number (1490400).

Almost surely, 2^20253121 is an apocalyptic number.

It is an amenable number.

20253121 is a deficient number, since it is larger than the sum of its proper divisors (3593279).

20253121 is an equidigital number, since it uses as much as digits as its factorization.

20253121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589 (or 575 counting only the distinct ones).

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

The square root of 20253121 is about 4500.3467644172. The cubic root of 20253121 is about 272.5820912508.

Adding to 20253121 its reverse (12135202), we get a palindrome (32388323).

The spelling of 20253121 in words is "twenty million, two hundred fifty-three thousand, one hundred twenty-one".