22061621 has 4 divisors (see below), whose sum is σ = 22477932. Its totient is φ = 21645312.

The previous prime is 22061609. The next prime is 22061629. The reversal of 22061621 is 12616022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19624900 + 2436721 = 4430^2 + 1561^2 .

It is a cyclic number.

It is not a de Polignac number, because 22061621 - 2¹⁴ = 22045237 is a prime.

It is a super-2 number, since 2×22061621² = 973430242295282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22061593 and 22061602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22061629) 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, 208076 + ... + 208181.

It is an arithmetic number, because the mean of its divisors is an integer number (5619483).

Almost surely, 2^22061621 is an apocalyptic number.

It is an amenable number.

22061621 is a deficient number, since it is larger than the sum of its proper divisors (416311).

22061621 is an equidigital number, since it uses as much as digits as its factorization.

22061621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416310.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 22061621 is about 4696.9799871833. The cubic root of 22061621 is about 280.4653020164.

Adding to 22061621 its reverse (12616022), we get a palindrome (34677643).

The spelling of 22061621 in words is "twenty-two million, sixty-one thousand, six hundred twenty-one".