22061881 has 4 divisors (see below), whose sum is σ = 22574992. Its totient is φ = 21548772.

The previous prime is 22061873. The next prime is 22061891. The reversal of 22061881 is 18816022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18816022 = 2 ⋅9408011.

It is a cyclic number.

It is not a de Polignac number, because 22061881 - 2³ = 22061873 is a prime.

It is a super-2 number, since 2×22061881² = 973453186516322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22061821) 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 3 ways as a sum of consecutive naturals, for example, 256491 + ... + 256576.

It is an arithmetic number, because the mean of its divisors is an integer number (5643748).

Almost surely, 2^22061881 is an apocalyptic number.

It is an amenable number.

22061881 is a deficient number, since it is larger than the sum of its proper divisors (513111).

22061881 is an equidigital number, since it uses as much as digits as its factorization.

22061881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513110.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 22061881 is about 4697.0076644604. The cubic root of 22061881 is about 280.4664037893.

The spelling of 22061881 in words is "twenty-two million, sixty-one thousand, eight hundred eighty-one".