135922821 has 4 divisors (see below), whose sum is σ = 181230432. Its totient is φ = 90615212.

The previous prime is 135922819. The next prime is 135922873. The reversal of 135922821 is 128229531.

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 135922821 - 2¹ = 135922819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135922811) 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, 22653801 + ... + 22653806.

It is an arithmetic number, because the mean of its divisors is an integer number (45307608).

Almost surely, 2^135922821 is an apocalyptic number.

It is an amenable number.

135922821 is a deficient number, since it is larger than the sum of its proper divisors (45307611).

135922821 is an equidigital number, since it uses as much as digits as its factorization.

135922821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45307610.

The product of its digits is 8640, while the sum is 33.

The square root of 135922821 is about 11658.5942977702. The cubic root of 135922821 is about 514.1590208311.

The spelling of 135922821 in words is "one hundred thirty-five million, nine hundred twenty-two thousand, eight hundred twenty-one".