40621421 has 4 divisors (see below), whose sum is σ = 40772700. Its totient is φ = 40470144.

The previous prime is 40621417. The next prime is 40621433. The reversal of 40621421 is 12412604.

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 2044900 + 38576521 = 1430^2 + 6211^2 .

It is a cyclic number.

It is not a de Polignac number, because 40621421 - 2² = 40621417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40621393 and 40621402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40621121) 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, 75236 + ... + 75773.

It is an arithmetic number, because the mean of its divisors is an integer number (10193175).

Almost surely, 2^40621421 is an apocalyptic number.

It is an amenable number.

40621421 is a deficient number, since it is larger than the sum of its proper divisors (151279).

40621421 is a wasteful number, since it uses less digits than its factorization.

40621421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151278.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 40621421 is about 6373.4936259480. The cubic root of 40621421 is about 343.7571213511.

The spelling of 40621421 in words is "forty million, six hundred twenty-one thousand, four hundred twenty-one".