401424421 has 2 divisors, whose sum is σ = 401424422. Its totient is φ = 401424420.

The previous prime is 401424407. The next prime is 401424431. The reversal of 401424421 is 124424104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 364275396 + 37149025 = 19086^2 + 6095^2 .

It is a cyclic number.

It is not a de Polignac number, because 401424421 - 2²³ = 393035813 is a prime.

It is a super-2 number, since 2×401424421² = 322283131550370482, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 401424392 and 401424401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401424431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200712210 + 200712211.

It is an arithmetic number, because the mean of its divisors is an integer number (200712211).

Almost surely, 2^401424421 is an apocalyptic number.

It is an amenable number.

401424421 is a deficient number, since it is larger than the sum of its proper divisors (1).

401424421 is an equidigital number, since it uses as much as digits as its factorization.

401424421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 401424421 is about 20035.5788785850. The cubic root of 401424421 is about 737.6798655811.

Adding to 401424421 its reverse (124424104), we get a palindrome (525848525).

The spelling of 401424421 in words is "four hundred one million, four hundred twenty-four thousand, four hundred twenty-one".