400144311021 has 24 divisors (see below), whose sum is σ = 668372918304. Its totient is φ = 211065130080.

The previous prime is 400144311001. The next prime is 400144311029. The reversal of 400144311021 is 120113441004.

It is not a de Polignac number, because 400144311021 - 2⁶ = 400144310957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400144311029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104693095 + ... + 104696916.

It is an arithmetic number, because the mean of its divisors is an integer number (27848871596).

Almost surely, 2^400144311021 is an apocalyptic number.

It is an amenable number.

400144311021 is a deficient number, since it is larger than the sum of its proper divisors (268228607283).

400144311021 is a wasteful number, since it uses less digits than its factorization.

400144311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209390041 (or 209390034 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 400144311021 its reverse (120113441004), we get a palindrome (520257752025).

The spelling of 400144311021 in words is "four hundred billion, one hundred forty-four million, three hundred eleven thousand, twenty-one".