400230022021 has 4 divisors (see below), whose sum is σ = 400256625132. Its totient is φ = 400203418912.

The previous prime is 400230022009. The next prime is 400230022043. The reversal of 400230022021 is 120220032004.

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 394684241121 + 5545780900 = 628239^2 + 74470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400230022021 is a prime.

It is a super-3 number, since 3×400230022021³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400230021986 and 400230022004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400230022091) 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, 13278976 + ... + 13309081.

It is an arithmetic number, because the mean of its divisors is an integer number (100064156283).

Almost surely, 2^400230022021 is an apocalyptic number.

It is an amenable number.

400230022021 is a deficient number, since it is larger than the sum of its proper divisors (26603111).

400230022021 is a wasteful number, since it uses less digits than its factorization.

400230022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26603110.

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 400230022021 its reverse (120220032004), we get a palindrome (520450054025).

The spelling of 400230022021 in words is "four hundred billion, two hundred thirty million, twenty-two thousand, twenty-one".