21430763 has 4 divisors (see below), whose sum is σ = 21440280. Its totient is φ = 21421248.

The previous prime is 21430757. The next prime is 21430769. The reversal of 21430763 is 36703412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (21430757) and next prime (21430769).

It is a cyclic number.

It is not a de Polignac number, because 21430763 - 2¹⁸ = 21168619 is a prime.

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 (21430769) 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, 731 + ... + 6587.

It is an arithmetic number, because the mean of its divisors is an integer number (5360070).

Almost surely, 2^21430763 is an apocalyptic number.

21430763 is a deficient number, since it is larger than the sum of its proper divisors (9517).

21430763 is an equidigital number, since it uses as much as digits as its factorization.

21430763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9516.

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

The square root of 21430763 is about 4629.3372095798. The cubic root of 21430763 is about 277.7660808526.

The spelling of 21430763 in words is "twenty-one million, four hundred thirty thousand, seven hundred sixty-three".