21776630 has 32 divisors (see below), whose sum is σ = 41494464. Its totient is φ = 8211456.

The previous prime is 21776611. The next prime is 21776647. The reversal of 21776630 is 3667712.

It is a super-2 number, since 2×21776630² = 948443228313800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16142 + ... + 17438.

It is an arithmetic number, because the mean of its divisors is an integer number (1296702).

Almost surely, 2^21776630 is an apocalyptic number.

21776630 is a deficient number, since it is larger than the sum of its proper divisors (19717834).

21776630 is a wasteful number, since it uses less digits than its factorization.

21776630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 21776630 is about 4666.5436888558. The cubic root of 21776630 is about 279.2523848555.

The spelling of 21776630 in words is "twenty-one million, seven hundred seventy-six thousand, six hundred thirty".