21122630 has 8 divisors (see below), whose sum is σ = 38020752. Its totient is φ = 8449048.

The previous prime is 21122611. The next prime is 21122641. The reversal of 21122630 is 3622112.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21122599 and 21122608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056122 + ... + 1056141.

It is an arithmetic number, because the mean of its divisors is an integer number (4752594).

Almost surely, 2^21122630 is an apocalyptic number.

21122630 is a deficient number, since it is larger than the sum of its proper divisors (16898122).

21122630 is a wasteful number, since it uses less digits than its factorization.

21122630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112270.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21122630 is about 4595.9362484699. The cubic root of 21122630 is about 276.4284024699.

Adding to 21122630 its reverse (3622112), we get a palindrome (24744742).

The spelling of 21122630 in words is "twenty-one million, one hundred twenty-two thousand, six hundred thirty".