151421 has 4 divisors (see below), whose sum is σ = 154332. Its totient is φ = 148512.

The previous prime is 151397. The next prime is 151423. The reversal of 151421 is 124151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 105625 + 45796 = 325^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 151421 - 2⁶ = 151357 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 = 151396 and 151405.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 151421.

It is not an unprimeable number, because it can be changed into a prime (151423) 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, 1376 + ... + 1481.

It is an arithmetic number, because the mean of its divisors is an integer number (38583).

2¹⁵¹⁴²¹ is an apocalyptic number.

It is an amenable number.

151421 is a deficient number, since it is larger than the sum of its proper divisors (2911).

151421 is an equidigital number, since it uses as much as digits as its factorization.

151421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2910.

The product of its digits is 40, while the sum is 14.

The square root of 151421 is about 389.1285134759. The cubic root of 151421 is about 53.3001833926.

Adding to 151421 its reverse (124151), we get a palindrome (275572).

The spelling of 151421 in words is "one hundred fifty-one thousand, four hundred twenty-one".