420120331021 has 4 divisors (see below), whose sum is σ = 420121790172. Its totient is φ = 420118871872.

The previous prime is 420120330991. The next prime is 420120331069. The reversal of 420120331021 is 120133021024.

It is a happy number.

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 394227015625 + 25893315396 = 627875^2 + 160914^2 .

It is a cyclic number.

It is not a de Polignac number, because 420120331021 - 2¹³ = 420120322829 is a prime.

It is a super-2 number, since 2×420120331021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420120331021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420120331321) 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, 137566 + ... + 926911.

It is an arithmetic number, because the mean of its divisors is an integer number (105030447543).

Almost surely, 2^420120331021 is an apocalyptic number.

It is an amenable number.

420120331021 is a deficient number, since it is larger than the sum of its proper divisors (1459151).

420120331021 is a wasteful number, since it uses less digits than its factorization.

420120331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459150.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 420120331021 its reverse (120133021024), we get a palindrome (540253352045).

The spelling of 420120331021 in words is "four hundred twenty billion, one hundred twenty million, three hundred thirty-one thousand, twenty-one".