22161402 has 24 divisors (see below), whose sum is σ = 49189140. Its totient is φ = 7206720.

The previous prime is 22161379. The next prime is 22161407. The reversal of 22161402 is 20416122.

It can be written as a sum of positive squares in 2 ways, for example, as 22099401 + 62001 = 4701^2 + 249^2 .

It is a super-2 number, since 2×22161402² = 982255477211208, which contains 22 as substring.

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 (22161407) 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, 14277 + ... + 15752.

Almost surely, 2^22161402 is an apocalyptic number.

22161402 is an abundant number, since it is smaller than the sum of its proper divisors (27027738).

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

22161402 is a wasteful number, since it uses less digits than its factorization.

22161402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30078 (or 30075 counting only the distinct ones).

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

The square root of 22161402 is about 4707.5898292014. The cubic root of 22161402 is about 280.8874986045.

Adding to 22161402 its reverse (20416122), we get a palindrome (42577524).

The spelling of 22161402 in words is "twenty-two million, one hundred sixty-one thousand, four hundred two".