402440213021 has 8 divisors (see below), whose sum is σ = 501743642304. Its totient is φ = 313589776320.

The previous prime is 402440212997. The next prime is 402440213057. The reversal of 402440213021 is 120312044204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402440213021 - 2²² = 402436018717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402440213081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2613248060 + ... + 2613248213.

It is an arithmetic number, because the mean of its divisors is an integer number (62717955288).

Almost surely, 2^402440213021 is an apocalyptic number.

It is an amenable number.

402440213021 is a deficient number, since it is larger than the sum of its proper divisors (99303429283).

402440213021 is a wasteful number, since it uses less digits than its factorization.

402440213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5226496291.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 402440213021 its reverse (120312044204), we get a palindrome (522752257225).

The spelling of 402440213021 in words is "four hundred two billion, four hundred forty million, two hundred thirteen thousand, twenty-one".