201622421 has 24 divisors (see below), whose sum is σ = 272775552. Its totient is φ = 145015200.

The previous prime is 201622417. The next prime is 201622427. The reversal of 201622421 is 124226102.

It is a happy number.

It is not a de Polignac number, because 201622421 - 2² = 201622417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201622393 and 201622402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201622427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1856 + ... + 20166.

It is an arithmetic number, because the mean of its divisors is an integer number (11365648).

Almost surely, 2^201622421 is an apocalyptic number.

It is an amenable number.

201622421 is a deficient number, since it is larger than the sum of its proper divisors (71153131).

201622421 is a wasteful number, since it uses less digits than its factorization.

201622421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18353 (or 18342 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 201622421 is about 14199.3810076355. The cubic root of 201622421 is about 586.3806201009.

Adding to 201622421 its reverse (124226102), we get a palindrome (325848523).

The spelling of 201622421 in words is "two hundred one million, six hundred twenty-two thousand, four hundred twenty-one".