420972837781 has 4 divisors (see below), whose sum is σ = 420974137792. Its totient is φ = 420971537772.

The previous prime is 420972837763. The next prime is 420972837787. The reversal of 420972837781 is 187738279024.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 420972837781 - 2⁷ = 420972837653 is a prime.

It is a super-2 number, since 2×420972837781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420972837787) 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, 266260 + ... + 955426.

It is an arithmetic number, because the mean of its divisors is an integer number (105243534448).

Almost surely, 2^420972837781 is an apocalyptic number.

It is an amenable number.

420972837781 is a deficient number, since it is larger than the sum of its proper divisors (1300011).

420972837781 is an equidigital number, since it uses as much as digits as its factorization.

420972837781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300010.

The product of its (nonzero) digits is 9483264, while the sum is 58.

The spelling of 420972837781 in words is "four hundred twenty billion, nine hundred seventy-two million, eight hundred thirty-seven thousand, seven hundred eighty-one".