421002765 has 20 divisors (see below), whose sum is σ = 754687164. Its totient is φ = 224534592.

The previous prime is 421002763. The next prime is 421002793. The reversal of 421002765 is 567200124.

It can be written as a sum of positive squares in 2 ways, for example, as 135629316 + 285373449 = 11646^2 + 16893^2 .

It is not a de Polignac number, because 421002765 - 2¹ = 421002763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421002763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 519352 + ... + 520161.

Almost surely, 2^421002765 is an apocalyptic number.

421002765 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

421002765 is a deficient number, since it is larger than the sum of its proper divisors (333684399).

421002765 is a wasteful number, since it uses less digits than its factorization.

421002765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039530 (or 1039521 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 421002765 is about 20518.3519074998. The cubic root of 421002765 is about 749.4827633704.

Adding to 421002765 its reverse (567200124), we get a palindrome (988202889).

The spelling of 421002765 in words is "four hundred twenty-one million, two thousand, seven hundred sixty-five".