21522763 has 8 divisors (see below), whose sum is σ = 22726800. Its totient is φ = 20325888.

The previous prime is 21522749. The next prime is 21522791. The reversal of 21522763 is 36722512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21522763 - 2⁹ = 21522251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21523763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5103 + ... + 8311.

It is an arithmetic number, because the mean of its divisors is an integer number (2840850).

Almost surely, 2^21522763 is an apocalyptic number.

21522763 is a deficient number, since it is larger than the sum of its proper divisors (1204037).

21522763 is a wasteful number, since it uses less digits than its factorization.

21522763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581.

The product of its digits is 5040, while the sum is 28.

The square root of 21522763 is about 4639.2631958103. The cubic root of 21522763 is about 278.1629869084.

The spelling of 21522763 in words is "twenty-one million, five hundred twenty-two thousand, seven hundred sixty-three".