421102890 has 144 divisors (see below), whose sum is σ = 1245659688. Its totient is φ = 98102016.

The previous prime is 421102873. The next prime is 421102897. The reversal of 421102890 is 98201124.

It can be written as a sum of positive squares in 4 ways, for example, as 338964921 + 82137969 = 18411^2 + 9063^2 .

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421102897) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 421872 + ... + 422868.

Almost surely, 2^421102890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421102890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (622829844).

421102890 is an abundant number, since it is smaller than the sum of its proper divisors (824556798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421102890 is a wasteful number, since it uses less digits than its factorization.

421102890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061 (or 1039 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 421102890 is about 20520.7916513959. The cubic root of 421102890 is about 749.5421739172.

The spelling of 421102890 in words is "four hundred twenty-one million, one hundred two thousand, eight hundred ninety".