21372122 has 8 divisors (see below), whose sum is σ = 32740416. Its totient is φ = 10458652.

The previous prime is 21372103. The next prime is 21372133. The reversal of 21372122 is 22127312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21372094 and 21372103.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113588 + ... + 113775.

It is an arithmetic number, because the mean of its divisors is an integer number (4092552).

Almost surely, 2^21372122 is an apocalyptic number.

21372122 is a deficient number, since it is larger than the sum of its proper divisors (11368294).

21372122 is a wasteful number, since it uses less digits than its factorization.

21372122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227412.

The product of its digits is 336, while the sum is 20.

The square root of 21372122 is about 4622.9992429158. Note that the first 3 decimals coincide. The cubic root of 21372122 is about 277.5124989636.

Adding to 21372122 its reverse (22127312), we get a palindrome (43499434).

The spelling of 21372122 in words is "twenty-one million, three hundred seventy-two thousand, one hundred twenty-two".