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BaseRepresentation
bin101010010110…
…0011101101101
31112202222201111
41110230131231
521140432341
62111512021
7356500336
oct124543555
945688644
1022202221
1111594948
127528611
1347a4912
142d3d28d
151e38681
hex152c76d

22202221 has 8 divisors (see below), whose sum is σ = 23567544. Its totient is φ = 20843520.

The previous prime is 22202209. The next prime is 22202249. The reversal of 22202221 is 12220222.

It can be written as a sum of positive squares in 4 ways, for example, as 3279721 + 18922500 = 1811^2 + 4350^2 .

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 22202221 - 27 = 22202093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22202261) 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, 6421 + ... + 9253.

It is an arithmetic number, because the mean of its divisors is an integer number (2945943).

Almost surely, 222202221 is an apocalyptic number.

It is an amenable number.

22202221 is a deficient number, since it is larger than the sum of its proper divisors (1365323).

22202221 is a wasteful number, since it uses less digits than its factorization.

22202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3311.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 22202221 is about 4711.9232803602. The cubic root of 22202221 is about 281.0598480277.

Adding to 22202221 its reverse (12220222), we get a palindrome (34422443).

The spelling of 22202221 in words is "twenty-two million, two hundred two thousand, two hundred twenty-one".

Divisors: 1 17 461 2833 7837 48161 1306013 22202221