21034763 has 16 divisors (see below), whose sum is σ = 23115456. Its totient is φ = 19061760.

The previous prime is 21034757. The next prime is 21034787. The reversal of 21034763 is 36743012.

It is not a de Polignac number, because 21034763 - 2⁴ = 21034747 is a prime.

It is a super-2 number, since 2×21034763² = 884922508932338, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71645 + ... + 71937.

It is an arithmetic number, because the mean of its divisors is an integer number (1444716).

Almost surely, 2^21034763 is an apocalyptic number.

21034763 is a deficient number, since it is larger than the sum of its proper divisors (2080693).

21034763 is a wasteful number, since it uses less digits than its factorization.

21034763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 21034763 is about 4586.3670808168. The cubic root of 21034763 is about 276.0445693970.

Adding to 21034763 its reverse (36743012), we get a palindrome (57777775).

The spelling of 21034763 in words is "twenty-one million, thirty-four thousand, seven hundred sixty-three".