21963061 has 4 divisors (see below), whose sum is σ = 21982752. Its totient is φ = 21943372.

The previous prime is 21963017. The next prime is 21963077. The reversal of 21963061 is 16036912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21963061 - 2⁷ = 21962933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21963001) 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, 8065 + ... + 10438.

It is an arithmetic number, because the mean of its divisors is an integer number (5495688).

Almost surely, 2^21963061 is an apocalyptic number.

It is an amenable number.

21963061 is a deficient number, since it is larger than the sum of its proper divisors (19691).

21963061 is a wasteful number, since it uses less digits than its factorization.

21963061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19690.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 21963061 is about 4686.4763949048. The cubic root of 21963061 is about 280.0470201647.

Adding to 21963061 its reverse (16036912), we get a palindrome (37999973).

The spelling of 21963061 in words is "twenty-one million, nine hundred sixty-three thousand, sixty-one".