149407021 has 2 divisors, whose sum is σ = 149407022. Its totient is φ = 149407020.

The previous prime is 149407019. The next prime is 149407039. The reversal of 149407021 is 120704941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107868996 + 41538025 = 10386^2 + 6445^2 .

It is a cyclic number.

It is not a de Polignac number, because 149407021 - 2¹ = 149407019 is a prime.

Together with 149407019, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_8412922 and since 149407021 and 8412922 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149407001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74703510 + 74703511.

It is an arithmetic number, because the mean of its divisors is an integer number (74703511).

Almost surely, 2^149407021 is an apocalyptic number.

It is an amenable number.

149407021 is a deficient number, since it is larger than the sum of its proper divisors (1).

149407021 is an equidigital number, since it uses as much as digits as its factorization.

149407021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 149407021 is about 12223.2164752163. The cubic root of 149407021 is about 530.6282108229.

The spelling of 149407021 in words is "one hundred forty-nine million, four hundred seven thousand, twenty-one".