49942021 has 2 divisors, whose sum is σ = 49942022. Its totient is φ = 49942020.

The previous prime is 49942019. The next prime is 49942027. The reversal of 49942021 is 12024994.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27720225 + 22221796 = 5265^2 + 4714^2 .

It is a cyclic number.

It is not a de Polignac number, because 49942021 - 2¹ = 49942019 is a prime.

Together with 49942019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49942027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24971010 + 24971011.

It is an arithmetic number, because the mean of its divisors is an integer number (24971011).

Almost surely, 2^49942021 is an apocalyptic number.

It is an amenable number.

49942021 is a deficient number, since it is larger than the sum of its proper divisors (1).

49942021 is an equidigital number, since it uses as much as digits as its factorization.

49942021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 49942021 is about 7066.9668882768. The cubic root of 49942021 is about 368.2606971466.

The spelling of 49942021 in words is "forty-nine million, nine hundred forty-two thousand, twenty-one".