406634225021 has 4 divisors (see below), whose sum is σ = 406642546332. Its totient is φ = 406625903712.

The previous prime is 406634225017. The next prime is 406634225059. The reversal of 406634225021 is 120522436604.

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 144757420900 + 261876804121 = 380470^2 + 511739^2 .

It is a cyclic number.

It is not a de Polignac number, because 406634225021 - 2² = 406634225017 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 (406634225071) 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, 4086920 + ... + 4185233.

It is an arithmetic number, because the mean of its divisors is an integer number (101660636583).

Almost surely, 2^406634225021 is an apocalyptic number.

It is an amenable number.

406634225021 is a deficient number, since it is larger than the sum of its proper divisors (8321311).

406634225021 is an equidigital number, since it uses as much as digits as its factorization.

406634225021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8321310.

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 406634225021 in words is "four hundred six billion, six hundred thirty-four million, two hundred twenty-five thousand, twenty-one".