401251421 has 8 divisors (see below), whose sum is σ = 413573304. Its totient is φ = 389007360.

The previous prime is 401251343. The next prime is 401251451. The reversal of 401251421 is 124152104.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 209844196 + 191407225 = 14486^2 + 13835^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401251421 is a prime.

It is a super-2 number, since 2×401251421² = 322005405709038482, 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 = 401251393 and 401251402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401251451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8900 + ... + 29693.

It is an arithmetic number, because the mean of its divisors is an integer number (51696663).

Almost surely, 2^401251421 is an apocalyptic number.

It is an amenable number.

401251421 is a deficient number, since it is larger than the sum of its proper divisors (12321883).

401251421 is a wasteful number, since it uses less digits than its factorization.

401251421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38911.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 401251421 is about 20031.2610936007. The cubic root of 401251421 is about 737.5738788768.

The spelling of 401251421 in words is "four hundred one million, two hundred fifty-one thousand, four hundred twenty-one".