22029881 has 4 divisors (see below), whose sum is σ = 22232100. Its totient is φ = 21827664.

The previous prime is 22029863. The next prime is 22029901. The reversal of 22029881 is 18892022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18892022 = 2 ⋅9446011.

It can be written as a sum of positive squares in 2 ways, for example, as 14100025 + 7929856 = 3755^2 + 2816^2 .

It is a cyclic number.

It is not a de Polignac number, because 22029881 - 2¹⁸ = 21767737 is a prime.

It is a super-2 number, since 2×22029881² = 970631313748322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22029811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100946 + ... + 101163.

It is an arithmetic number, because the mean of its divisors is an integer number (5558025).

Almost surely, 2^22029881 is an apocalyptic number.

It is an amenable number.

22029881 is a deficient number, since it is larger than the sum of its proper divisors (202219).

22029881 is a wasteful number, since it uses less digits than its factorization.

22029881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202218.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 22029881 is about 4693.6000042611. The cubic root of 22029881 is about 280.3307358818.

The spelling of 22029881 in words is "twenty-two million, twenty-nine thousand, eight hundred eighty-one".