21620027 has 8 divisors (see below), whose sum is σ = 25399920. Its totient is φ = 18142560.

The previous prime is 21620021. The next prime is 21620059. The reversal of 21620027 is 72002612.

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

It is a cyclic number.

It is not a de Polignac number, because 21620027 - 2⁶ = 21619963 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21619990 and 21620008.

It is not an unprimeable number, because it can be changed into a prime (21620021) 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, 75452 + ... + 75737.

It is an arithmetic number, because the mean of its divisors is an integer number (3174990).

Almost surely, 2^21620027 is an apocalyptic number.

21620027 is a deficient number, since it is larger than the sum of its proper divisors (3779893).

21620027 is a wasteful number, since it uses less digits than its factorization.

21620027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151213.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21620027 is about 4649.7340784178. The cubic root of 21620027 is about 278.5813748178.

Adding to 21620027 its reverse (72002612), we get a palindrome (93622639).

The spelling of 21620027 in words is "twenty-one million, six hundred twenty thousand, twenty-seven".