151021 has 4 divisors (see below), whose sum is σ = 162652. Its totient is φ = 139392.

The previous prime is 151013. The next prime is 151027. The reversal of 151021 is 120151.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120151 = 53 ⋅2267.

It can be written as a sum of positive squares in 2 ways, for example, as 36100 + 114921 = 190^2 + 339^2 .

It is a cyclic number.

It is not a de Polignac number, because 151021 - 2³ = 151013 is a prime.

It is a super-3 number, since 3×151021³ = 10333162988346783, which contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 150989 and 151007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151027) 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, 5796 + ... + 5821.

It is an arithmetic number, because the mean of its divisors is an integer number (40663).

2¹⁵¹⁰²¹ is an apocalyptic number.

It is an amenable number.

151021 is a deficient number, since it is larger than the sum of its proper divisors (11631).

151021 is a wasteful number, since it uses less digits than its factorization.

151021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11630.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 151021 is about 388.6142045783. The cubic root of 151021 is about 53.2532086791.

Adding to 151021 its reverse (120151), we get a palindrome (271172).

The spelling of 151021 in words is "one hundred fifty-one thousand, twenty-one".