400245140021 has 8 divisors (see below), whose sum is σ = 411701727360. Its totient is φ = 388911083328.

The previous prime is 400245140017. The next prime is 400245140033. The reversal of 400245140021 is 120041542004.

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 400245140021 - 2² = 400245140017 is a prime.

It is a super-2 number, since 2×400245140021² (a number of 24 digits) contains 22 as substring.

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 (400245140041) 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, 30626036 + ... + 30639101.

It is an arithmetic number, because the mean of its divisors is an integer number (51462715920).

Almost surely, 2^400245140021 is an apocalyptic number.

It is an amenable number.

400245140021 is a deficient number, since it is larger than the sum of its proper divisors (11456587339).

400245140021 is a wasteful number, since it uses less digits than its factorization.

400245140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61265323.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 400245140021 its reverse (120041542004), we get a palindrome (520286682025).

The spelling of 400245140021 in words is "four hundred billion, two hundred forty-five million, one hundred forty thousand, twenty-one".