44213421 has 12 divisors (see below), whose sum is σ = 67419296. Its totient is φ = 25247400.

The previous prime is 44213419. The next prime is 44213423. The reversal of 44213421 is 12431244.

It is an interprime number because it is at equal distance from previous prime (44213419) and next prime (44213423).

It is not a de Polignac number, because 44213421 - 2¹ = 44213419 is a prime.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44213423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29746 + ... + 31196.

Almost surely, 2^44213421 is an apocalyptic number.

It is an amenable number.

44213421 is a deficient number, since it is larger than the sum of its proper divisors (23205875).

44213421 is an frugal number, since it uses more digits than its factorization.

44213421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2912 (or 1461 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 44213421 is about 6649.3173333809. The cubic root of 44213421 is about 353.6047089463.

Multiplying 44213421 by its sum of digits (21), we get a square (928481841 = 30471²).

44213421 divided by its sum of digits (21) gives a square (2105401 = 1451²).

Adding to 44213421 its reverse (12431244), we get a palindrome (56644665).

The spelling of 44213421 in words is "forty-four million, two hundred thirteen thousand, four hundred twenty-one".