149672021 has 4 divisors (see below), whose sum is σ = 149977344. Its totient is φ = 149366700.

The previous prime is 149672009. The next prime is 149672023. The reversal of 149672021 is 120276941.

It is a happy number.

149672021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120276941 = 251 ⋅479191.

It is a cyclic number.

It is not a de Polignac number, because 149672021 - 2⁶ = 149671957 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 (149672023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151925 + ... + 152906.

It is an arithmetic number, because the mean of its divisors is an integer number (37494336).

Almost surely, 2^149672021 is an apocalyptic number.

It is an amenable number.

149672021 is a deficient number, since it is larger than the sum of its proper divisors (305323).

149672021 is an equidigital number, since it uses as much as digits as its factorization.

149672021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305322.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 149672021 is about 12234.0517000706. The cubic root of 149672021 is about 530.9417467835.

The spelling of 149672021 in words is "one hundred forty-nine million, six hundred seventy-two thousand, twenty-one".