401400221 has 4 divisors (see below), whose sum is σ = 401441472. Its totient is φ = 401358972.

The previous prime is 401400211. The next prime is 401400401. The reversal of 401400221 is 122004104.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401400221 is a prime.

It is a super-2 number, since 2×401400221² = 322244274837697682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401400196 and 401400205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401400211) 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, 2966 + ... + 28488.

It is an arithmetic number, because the mean of its divisors is an integer number (100360368).

Almost surely, 2^401400221 is an apocalyptic number.

It is an amenable number.

401400221 is a deficient number, since it is larger than the sum of its proper divisors (41251).

401400221 is a wasteful number, since it uses less digits than its factorization.

401400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41250.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 401400221 is about 20034.9749438326. The cubic root of 401400221 is about 737.6650415274.

Adding to 401400221 its reverse (122004104), we get a palindrome (523404325).

The spelling of 401400221 in words is "four hundred one million, four hundred thousand, two hundred twenty-one".