21101963 has 2 divisors, whose sum is σ = 21101964. Its totient is φ = 21101962.

The previous prime is 21101933. The next prime is 21102023. The reversal of 21101963 is 36910112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101963 - 2¹⁰ = 21100939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21101903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550981 + 10550982.

It is an arithmetic number, because the mean of its divisors is an integer number (10550982).

Almost surely, 2^21101963 is an apocalyptic number.

21101963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101963 is an equidigital number, since it uses as much as digits as its factorization.

21101963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 21101963 is about 4593.6872988918. The cubic root of 21101963 is about 276.3382178346.

The spelling of 21101963 in words is "twenty-one million, one hundred one thousand, nine hundred sixty-three".