21350763 has 16 divisors (see below), whose sum is σ = 36149760. Its totient is φ = 12200328.

The previous prime is 21350753. The next prime is 21350803. The reversal of 21350763 is 36705312.

It is a happy number.

It is not a de Polignac number, because 21350763 - 2¹² = 21346667 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21350753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56295 + ... + 56672.

It is an arithmetic number, because the mean of its divisors is an integer number (2259360).

Almost surely, 2^21350763 is an apocalyptic number.

21350763 is a deficient number, since it is larger than the sum of its proper divisors (14798997).

21350763 is a wasteful number, since it uses less digits than its factorization.

21350763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112983 (or 112977 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 21350763 is about 4620.6885850488. The cubic root of 21350763 is about 277.4200207787.

The spelling of 21350763 in words is "twenty-one million, three hundred fifty thousand, seven hundred sixty-three".