150821421 has 4 divisors (see below), whose sum is σ = 201095232. Its totient is φ = 100547612.

The previous prime is 150821413. The next prime is 150821423. The reversal of 150821421 is 124128051.

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: 124128051 = 3 ⋅41376017.

It is a cyclic number.

It is not a de Polignac number, because 150821421 - 2³ = 150821413 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 150821391 and 150821400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (150821423) 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, 25136901 + ... + 25136906.

It is an arithmetic number, because the mean of its divisors is an integer number (50273808).

Almost surely, 2^150821421 is an apocalyptic number.

It is an amenable number.

150821421 is a deficient number, since it is larger than the sum of its proper divisors (50273811).

150821421 is an equidigital number, since it uses as much as digits as its factorization.

150821421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50273810.

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 150821421 is about 12280.9373013626. The cubic root of 150821421 is about 532.2973974117.

Adding to 150821421 its reverse (124128051), we get a palindrome (274949472).

The spelling of 150821421 in words is "one hundred fifty million, eight hundred twenty-one thousand, four hundred twenty-one".