21350963 has 4 divisors (see below), whose sum is σ = 22606920. Its totient is φ = 20095008.

The previous prime is 21350933. The next prime is 21350999. The reversal of 21350963 is 36905312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21350963 - 2⁶ = 21350899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21350933) 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, 627953 + ... + 627986.

It is an arithmetic number, because the mean of its divisors is an integer number (5651730).

Almost surely, 2^21350963 is an apocalyptic number.

21350963 is a deficient number, since it is larger than the sum of its proper divisors (1255957).

21350963 is a wasteful number, since it uses less digits than its factorization.

21350963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255956.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 21350963 is about 4620.7102267941. The cubic root of 21350963 is about 277.4208870059.

The spelling of 21350963 in words is "twenty-one million, three hundred fifty thousand, nine hundred sixty-three".