420195021157 has 4 divisors (see below), whose sum is σ = 420391651756. Its totient is φ = 419998390560.

The previous prime is 420195021139. The next prime is 420195021161. The reversal of 420195021157 is 751120591024.

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 245712541636 + 174482479521 = 495694^2 + 417711^2 .

It is a cyclic number.

It is not a de Polignac number, because 420195021157 - 2¹¹ = 420195019109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420195021167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98312094 + ... + 98316367.

It is an arithmetic number, because the mean of its divisors is an integer number (105097912939).

Almost surely, 2^420195021157 is an apocalyptic number.

It is an amenable number.

420195021157 is a deficient number, since it is larger than the sum of its proper divisors (196630599).

420195021157 is a wasteful number, since it uses less digits than its factorization.

420195021157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196630598.

The product of its (nonzero) digits is 25200, while the sum is 37.

The spelling of 420195021157 in words is "four hundred twenty billion, one hundred ninety-five million, twenty-one thousand, one hundred fifty-seven".