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2122220981 is a prime number
BaseRepresentation
bin111111001111110…
…1000010110110101
312110220022222220002
41332133220112311
513321242032411
6550330321045
7103406403116
oct17637502665
95426288802
102122220981
11999a36041
124b2889185
1327a89b17a
14161bd220d
15c64a633b
hex7e7e85b5

2122220981 has 2 divisors, whose sum is σ = 2122220982. Its totient is φ = 2122220980.

The previous prime is 2122220963. The next prime is 2122220983. The reversal of 2122220981 is 1890222212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1478787025 + 643433956 = 38455^2 + 25366^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122220981 - 26 = 2122220917 is a prime.

It is a super-2 number, since 2×21222209812 = 9007643784393204722, which contains 22 as substring.

Together with 2122220983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2122220983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061110490 + 1061110491.

It is an arithmetic number, because the mean of its divisors is an integer number (1061110491).

Almost surely, 22122220981 is an apocalyptic number.

It is an amenable number.

2122220981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122220981 is an equidigital number, since it uses as much as digits as its factorization.

2122220981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 2122220981 is about 46067.5697318623. The cubic root of 2122220981 is about 1285.0801084570.

The spelling of 2122220981 in words is "two billion, one hundred twenty-two million, two hundred twenty thousand, nine hundred eighty-one".