200420253121 has 4 divisors (see below), whose sum is σ = 218640276144. Its totient is φ = 182200230100.

The previous prime is 200420253113. The next prime is 200420253133. The reversal of 200420253121 is 121352024002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 200420253121 - 2³ = 200420253113 is a prime.

It is a super-2 number, since 2×200420253121² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200420253092 and 200420253101.

It is not an unprimeable number, because it can be changed into a prime (200420253191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9110011495 + ... + 9110011516.

It is an arithmetic number, because the mean of its divisors is an integer number (54660069036).

Almost surely, 2^200420253121 is an apocalyptic number.

It is an amenable number.

200420253121 is a deficient number, since it is larger than the sum of its proper divisors (18220023023).

200420253121 is a wasteful number, since it uses less digits than its factorization.

200420253121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18220023022.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 200420253121 its reverse (121352024002), we get a palindrome (321772277123).

The spelling of 200420253121 in words is "two hundred billion, four hundred twenty million, two hundred fifty-three thousand, one hundred twenty-one".