29922421 has 4 divisors (see below), whose sum is σ = 29933452. Its totient is φ = 29911392.

The previous prime is 29922383. The next prime is 29922437. The reversal of 29922421 is 12422992.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 22221796 + 7700625 = 4714^2 + 2775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29922421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29922821) 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, 1705 + ... + 7921.

It is an arithmetic number, because the mean of its divisors is an integer number (7483363).

Almost surely, 2^29922421 is an apocalyptic number.

It is an amenable number.

29922421 is a deficient number, since it is larger than the sum of its proper divisors (11031).

29922421 is an equidigital number, since it uses as much as digits as its factorization.

29922421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11030.

The product of its digits is 5184, while the sum is 31.

The square root of 29922421 is about 5470.1390293118. The cubic root of 29922421 is about 310.4551793985.

The spelling of 29922421 in words is "twenty-nine million, nine hundred twenty-two thousand, four hundred twenty-one".