22321861 has 2 divisors, whose sum is σ = 22321862. Its totient is φ = 22321860.

The previous prime is 22321853. The next prime is 22321919. The reversal of 22321861 is 16812322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22268961 + 52900 = 4719^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 22321861 - 2³ = 22321853 is a prime.

It is a super-3 number, since 3×22321861³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22321811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11160930 + 11160931.

It is an arithmetic number, because the mean of its divisors is an integer number (11160931).

Almost surely, 2^22321861 is an apocalyptic number.

It is an amenable number.

22321861 is a deficient number, since it is larger than the sum of its proper divisors (1).

22321861 is an equidigital number, since it uses as much as digits as its factorization.

22321861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 22321861 is about 4724.6016763321. The cubic root of 22321861 is about 281.5637883137.

It can be divided in two parts, 223 and 21861, that multiplied together give a triangular number (4875003 = T₃₁₂₂).

The spelling of 22321861 in words is "twenty-two million, three hundred twenty-one thousand, eight hundred sixty-one".