49991221 has 20 divisors (see below), whose sum is σ = 59694912. Its totient is φ = 41843256.

The previous prime is 49991219. The next prime is 49991239. The reversal of 49991221 is 12219994.

It is not a de Polignac number, because 49991221 - 2¹ = 49991219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49991281) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 112626 + ... + 113068.

Almost surely, 2^49991221 is an apocalyptic number.

It is an amenable number.

49991221 is a deficient number, since it is larger than the sum of its proper divisors (9703691).

49991221 is an frugal number, since it uses more digits than its factorization.

49991221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 497 counting only the distinct ones).

The product of its digits is 11664, while the sum is 37.

The square root of 49991221 is about 7070.4470155712. The cubic root of 49991221 is about 368.3815871936.

The spelling of 49991221 in words is "forty-nine million, nine hundred ninety-one thousand, two hundred twenty-one".