21622061 has 2 divisors, whose sum is σ = 21622062. Its totient is φ = 21622060.

The previous prime is 21622037. The next prime is 21622099. The reversal of 21622061 is 16022612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17598025 + 4024036 = 4195^2 + 2006^2 .

It is a cyclic number.

It is not a de Polignac number, because 21622061 - 2⁶ = 21621997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21624061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10811030 + 10811031.

It is an arithmetic number, because the mean of its divisors is an integer number (10811031).

Almost surely, 2^21622061 is an apocalyptic number.

It is an amenable number.

21622061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21622061 is an equidigital number, since it uses as much as digits as its factorization.

21622061 is an evil number, because the sum of its binary digits is even.

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

The square root of 21622061 is about 4649.9527954593. The cubic root of 21622061 is about 278.5901108037.

Adding to 21622061 its reverse (16022612), we get a palindrome (37644673).

The spelling of 21622061 in words is "twenty-one million, six hundred twenty-two thousand, sixty-one".