40421251 has 6 divisors (see below), whose sum is σ = 43769940. Its totient is φ = 37311768.

The previous prime is 40421239. The next prime is 40421263. The reversal of 40421251 is 15212404.

It is an interprime number because it is at equal distance from previous prime (40421239) and next prime (40421263).

It is not a de Polignac number, because 40421251 - 2⁷ = 40421123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40421221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119421 + ... + 119758.

It is an arithmetic number, because the mean of its divisors is an integer number (7294990).

Almost surely, 2^40421251 is an apocalyptic number.

40421251 is a deficient number, since it is larger than the sum of its proper divisors (3348689).

40421251 is a wasteful number, since it uses less digits than its factorization.

40421251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239205 (or 239192 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 40421251 is about 6357.7709144007. The cubic root of 40421251 is about 343.1915478482.

Adding to 40421251 its reverse (15212404), we get a palindrome (55633655).

The spelling of 40421251 in words is "forty million, four hundred twenty-one thousand, two hundred fifty-one".