21201963 has 8 divisors (see below), whose sum is σ = 28300176. Its totient is φ = 14119200.

The previous prime is 21201937. The next prime is 21201979. The reversal of 21201963 is 36910212.

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

It is not a de Polignac number, because 21201963 - 2⁵ = 21201931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148 + ... + 6513.

It is an arithmetic number, because the mean of its divisors is an integer number (3537522).

Almost surely, 2^21201963 is an apocalyptic number.

21201963 is a deficient number, since it is larger than the sum of its proper divisors (7098213).

21201963 is a wasteful number, since it uses less digits than its factorization.

21201963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7725.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 21201963 is about 4604.5589365324. The cubic root of 21201963 is about 276.7740427715.

The spelling of 21201963 in words is "twenty-one million, two hundred one thousand, nine hundred sixty-three".