202421534321 has 2 divisors, whose sum is σ = 202421534322. Its totient is φ = 202421534320.

The previous prime is 202421534269. The next prime is 202421534327. The reversal of 202421534321 is 123435124202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176474767921 + 25946766400 = 420089^2 + 161080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202421534321 is a prime.

It is not a weakly prime, because it can be changed into another prime (202421534327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101210767160 + 101210767161.

It is an arithmetic number, because the mean of its divisors is an integer number (101210767161).

Almost surely, 2^202421534321 is an apocalyptic number.

It is an amenable number.

202421534321 is a deficient number, since it is larger than the sum of its proper divisors (1).

202421534321 is an equidigital number, since it uses as much as digits as its factorization.

202421534321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 202421534321 its reverse (123435124202), we get a palindrome (325856658523).

The spelling of 202421534321 in words is "two hundred two billion, four hundred twenty-one million, five hundred thirty-four thousand, three hundred twenty-one".