201940221 has 24 divisors (see below), whose sum is σ = 314708800. Its totient is φ = 115133928.

The previous prime is 201940217. The next prime is 201940223. The reversal of 201940221 is 122049102.

It is not a de Polignac number, because 201940221 - 2² = 201940217 is a prime.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201940223) 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, 455626 + ... + 456068.

Almost surely, 2^201940221 is an apocalyptic number.

201940221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201940221 is a deficient number, since it is larger than the sum of its proper divisors (112768579).

201940221 is an frugal number, since it uses more digits than its factorization.

201940221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 201940221 is about 14210.5672300581. The cubic root of 201940221 is about 586.6885454062.

Multiplying 201940221 by its sum of digits (21), we get a square (4240744641 = 65121²).

201940221 divided by its sum of digits (21) gives a square (9616201 = 3101²).

Adding to 201940221 its reverse (122049102), we get a palindrome (323989323).

The spelling of 201940221 in words is "two hundred one million, nine hundred forty thousand, two hundred twenty-one".