201222420 has 72 divisors (see below), whose sum is σ = 655419744. Its totient is φ = 45993024.

The previous prime is 201222409. The next prime is 201222451. The reversal of 201222420 is 24222102.

201222420 = T₈₅ + T₈₆ + ... + T₁₀₆₄.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 201222420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31282 + ... + 37161.

It is an arithmetic number, because the mean of its divisors is an integer number (9103052).

Almost surely, 2^201222420 is an apocalyptic number.

201222420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201222420 is an abundant number, since it is smaller than the sum of its proper divisors (454197324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201222420 is a wasteful number, since it uses less digits than its factorization.

201222420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68469 (or 68460 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 201222420 is about 14185.2888585323. The cubic root of 201222420 is about 585.9925876669.

Adding to 201222420 its reverse (24222102), we get a palindrome (225444522).

The spelling of 201222420 in words is "two hundred one million, two hundred twenty-two thousand, four hundred twenty".