21422051 has 8 divisors (see below), whose sum is σ = 24777984. Its totient is φ = 18140040.

The previous prime is 21422029. The next prime is 21422053. The reversal of 21422051 is 15022412.

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

It is a cyclic number.

It is not a de Polignac number, because 21422051 - 2¹⁴ = 21405667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21422053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17855 + ... + 19016.

It is an arithmetic number, because the mean of its divisors is an integer number (3097248).

Almost surely, 2^21422051 is an apocalyptic number.

21422051 is a deficient number, since it is larger than the sum of its proper divisors (3355933).

21422051 is an equidigital number, since it uses as much as digits as its factorization.

21422051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36961.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21422051 is about 4628.3961584981. The cubic root of 21422051 is about 277.7284367414.

Adding to 21422051 its reverse (15022412), we get a palindrome (36444463).

The spelling of 21422051 in words is "twenty-one million, four hundred twenty-two thousand, fifty-one".