211422021 has 8 divisors (see below), whose sum is σ = 282229920. Its totient is φ = 140781072.

The previous prime is 211422019. The next prime is 211422031. The reversal of 211422021 is 120224112.

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

It is not a de Polignac number, because 211422021 - 2¹ = 211422019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211422011) 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, 38751 + ... + 43868.

It is an arithmetic number, because the mean of its divisors is an integer number (35278740).

Almost surely, 2^211422021 is an apocalyptic number.

It is an amenable number.

211422021 is a deficient number, since it is larger than the sum of its proper divisors (70807899).

211422021 is an equidigital number, since it uses as much as digits as its factorization.

211422021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83475.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 211422021 is about 14540.3583518426. The cubic root of 211422021 is about 595.7308261929.

Adding to 211422021 its reverse (120224112), we get a palindrome (331646133).

The spelling of 211422021 in words is "two hundred eleven million, four hundred twenty-two thousand, twenty-one".