21960063 has 6 divisors (see below), whose sum is σ = 31720104. Its totient is φ = 14640036.

The previous prime is 21960053. The next prime is 21960077. The reversal of 21960063 is 36006912.

It is a happy number.

It is not a de Polignac number, because 21960063 - 2¹³ = 21951871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21960013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1219995 + ... + 1220012.

It is an arithmetic number, because the mean of its divisors is an integer number (5286684).

Almost surely, 2^21960063 is an apocalyptic number.

21960063 is a deficient number, since it is larger than the sum of its proper divisors (9760041).

21960063 is a wasteful number, since it uses less digits than its factorization.

21960063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440013 (or 2440010 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 21960063 is about 4686.1565274754. The cubic root of 21960063 is about 280.0342772662.

Adding to 21960063 its reverse (36006912), we get a palindrome (57966975).

The spelling of 21960063 in words is "twenty-one million, nine hundred sixty thousand, sixty-three".