151140021 has 4 divisors (see below), whose sum is σ = 201520032. Its totient is φ = 100760012.

The previous prime is 151140001. The next prime is 151140023. The reversal of 151140021 is 120041151.

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.

It is a cyclic number.

It is not a de Polignac number, because 151140021 - 2²¹ = 149042869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151140023) 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, 25190001 + ... + 25190006.

It is an arithmetic number, because the mean of its divisors is an integer number (50380008).

Almost surely, 2^151140021 is an apocalyptic number.

It is an amenable number.

151140021 is a deficient number, since it is larger than the sum of its proper divisors (50380011).

151140021 is an equidigital number, since it uses as much as digits as its factorization.

151140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50380010.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 151140021 is about 12293.9017809644. The cubic root of 151140021 is about 532.6719478212.

Adding to 151140021 its reverse (120041151), we get a palindrome (271181172).

The spelling of 151140021 in words is "one hundred fifty-one million, one hundred forty thousand, twenty-one".