22101642 has 24 divisors (see below), whose sum is σ = 48674340. Its totient is φ = 7246080.

The previous prime is 22101641. The next prime is 22101671. The reversal of 22101642 is 24610122.

22101642 is a `hidden beast` number, since 2 + 21 + 0 + 1 + 642 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21986721 + 114921 = 4689^2 + 339^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (22101641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8967 + ... + 11162.

Almost surely, 2^22101642 is an apocalyptic number.

22101642 is an abundant number, since it is smaller than the sum of its proper divisors (26572698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22101642 is a wasteful number, since it uses less digits than its factorization.

22101642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20198 (or 20195 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 22101642 is about 4701.2383474995. The cubic root of 22101642 is about 280.6347927562.

Adding to 22101642 its reverse (24610122), we get a palindrome (46711764).

The spelling of 22101642 in words is "twenty-two million, one hundred one thousand, six hundred forty-two".