400005151321 has 4 divisors (see below), whose sum is σ = 401900910544. Its totient is φ = 398109392100.

The previous prime is 400005151303. The next prime is 400005151327. The reversal of 400005151321 is 123151500004.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400005151321 - 2¹⁵ = 400005118553 is a prime.

It is a super-2 number, since 2×400005151321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400005151292 and 400005151301.

It is not an unprimeable number, because it can be changed into a prime (400005151327) 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, 947879295 + ... + 947879716.

It is an arithmetic number, because the mean of its divisors is an integer number (100475227636).

Almost surely, 2^400005151321 is an apocalyptic number.

It is an amenable number.

400005151321 is a deficient number, since it is larger than the sum of its proper divisors (1895759223).

400005151321 is a wasteful number, since it uses less digits than its factorization.

400005151321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895759222.

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 400005151321 its reverse (123151500004), we get a palindrome (523156651325).

The spelling of 400005151321 in words is "four hundred billion, five million, one hundred fifty-one thousand, three hundred twenty-one".