21377122 has 8 divisors (see below), whose sum is σ = 34532316. Its totient is φ = 9866352.

The previous prime is 21377119. The next prime is 21377129. The reversal of 21377122 is 22177312.

It can be written as a sum of positive squares in 2 ways, for example, as 16801801 + 4575321 = 4099^2 + 2139^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21377129) 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, 411073 + ... + 411124.

Almost surely, 2^21377122 is an apocalyptic number.

21377122 is a deficient number, since it is larger than the sum of its proper divisors (13155194).

21377122 is a wasteful number, since it uses less digits than its factorization.

21377122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822212.

The product of its digits is 1176, while the sum is 25.

The square root of 21377122 is about 4623.5399857685. The cubic root of 21377122 is about 277.5341385915.

The spelling of 21377122 in words is "twenty-one million, three hundred seventy-seven thousand, one hundred twenty-two".