151280021 has 4 divisors (see below), whose sum is σ = 151675392. Its totient is φ = 150884652.

The previous prime is 151280011. The next prime is 151280029. The reversal of 151280021 is 120082151.

It is a happy number.

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: 120082151 = 7 ⋅17154593.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-151280021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 151279975 and 151280002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151280029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197111 + ... + 197876.

It is an arithmetic number, because the mean of its divisors is an integer number (37918848).

Almost surely, 2^151280021 is an apocalyptic number.

It is an amenable number.

151280021 is a deficient number, since it is larger than the sum of its proper divisors (395371).

151280021 is an equidigital number, since it uses as much as digits as its factorization.

151280021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395370.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 151280021 is about 12299.5943429042. The cubic root of 151280021 is about 532.8363672301.

The spelling of 151280021 in words is "one hundred fifty-one million, two hundred eighty thousand, twenty-one".