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21221122 = 2131934229
BaseRepresentation
bin101000011110…
…0111100000010
31110221010220111
41100330330002
520413033442
62034501534
7345243106
oct120747402
943833814
1021221122
1110a8481a
1271348aa
1345201a0
142b65906
151ce2b17
hex143cf02

21221122 has 16 divisors (see below), whose sum is σ = 34466040. Its totient is φ = 9741312.

The previous prime is 21221113. The next prime is 21221129. The reversal of 21221122 is 22112212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18567481 + 2653641 = 4309^2 + 1629^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21221129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2904 + ... + 7132.

Almost surely, 221221122 is an apocalyptic number.

21221122 is a deficient number, since it is larger than the sum of its proper divisors (13244918).

21221122 is a wasteful number, since it uses less digits than its factorization.

21221122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4437.

The product of its digits is 32, while the sum is 13.

The square root of 21221122 is about 4606.6389048850. The cubic root of 21221122 is about 276.8573859574.

Adding to 21221122 its reverse (22112212), we get a palindrome (43333334).

The spelling of 21221122 in words is "twenty-one million, two hundred twenty-one thousand, one hundred twenty-two".

Divisors: 1 2 13 26 193 386 2509 4229 5018 8458 54977 109954 816197 1632394 10610561 21221122