421287940090 has 12 divisors (see below), whose sum is σ = 758321986734. Its totient is φ = 168514355024.

The previous prime is 421287940079. The next prime is 421287940097. The reversal of 421287940090 is 90049782124.

It can be written as a sum of positive squares in 3 ways, for example, as 202272364009 + 219015576081 = 449747^2 + 467991^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 421287940090.

It is not an unprimeable number, because it can be changed into a prime (421287940097) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1949904 + ... + 2155156.

Almost surely, 2^421287940090 is an apocalyptic number.

421287940090 is a deficient number, since it is larger than the sum of its proper divisors (337034046644).

421287940090 is an frugal number, since it uses more digits than its factorization.

421287940090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410513 (or 205260 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 421287940090 in words is "four hundred twenty-one billion, two hundred eighty-seven million, nine hundred forty thousand, ninety".