49921821 has 6 divisors (see below), whose sum is σ = 72109310. Its totient is φ = 33281208.

The previous prime is 49921819. The next prime is 49921831. The reversal of 49921821 is 12812994.

It can be written as a sum of positive squares in only one way, i.e., 41100921 + 8820900 = 6411^2 + 2970^2 .

It is not a de Polignac number, because 49921821 - 2¹ = 49921819 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49921801) 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, 2773426 + ... + 2773443.

Almost surely, 2^49921821 is an apocalyptic number.

It is an amenable number.

49921821 is a deficient number, since it is larger than the sum of its proper divisors (22187489).

49921821 is a wasteful number, since it uses less digits than its factorization.

49921821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5546875 (or 5546872 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 49921821 is about 7065.5375591670. The cubic root of 49921821 is about 368.2110404374.

The spelling of 49921821 in words is "forty-nine million, nine hundred twenty-one thousand, eight hundred twenty-one".