420400102332521 has 4 divisors (see below), whose sum is σ = 421021077373572. Its totient is φ = 419779127291472.

The previous prime is 420400102332479. The next prime is 420400102332547. The reversal of 420400102332521 is 125233201004024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 253180160196496 + 167219942136025 = 15911636^2 + 12931355^2 .

It is a cyclic number.

It is not a de Polignac number, because 420400102332521 - 2¹⁰ = 420400102331497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420400102382521) 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, 310487519510 + ... + 310487520863.

It is an arithmetic number, because the mean of its divisors is an integer number (105255269343393).

Almost surely, 2^{420400102332521} is an apocalyptic number.

It is an amenable number.

420400102332521 is a deficient number, since it is larger than the sum of its proper divisors (620975041051).

420400102332521 is an equidigital number, since it uses as much as digits as its factorization.

420400102332521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620975041050.

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

Adding to 420400102332521 its reverse (125233201004024), we get a palindrome (545633303336545).

The spelling of 420400102332521 in words is "four hundred twenty trillion, four hundred billion, one hundred two million, three hundred thirty-two thousand, five hundred twenty-one".