21620146 has 8 divisors (see below), whose sum is σ = 32457600. Its totient is φ = 10800948.

The previous prime is 21620129. The next prime is 21620153. The reversal of 21620146 is 64102612.

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

It is a super-2 number, since 2×21620146² = 934861426122632, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066 + ... + 6661.

It is an arithmetic number, because the mean of its divisors is an integer number (4057200).

Almost surely, 2^21620146 is an apocalyptic number.

21620146 is a deficient number, since it is larger than the sum of its proper divisors (10837454).

21620146 is a wasteful number, since it uses less digits than its factorization.

21620146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9128.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21620146 is about 4649.7468748309. The cubic root of 21620146 is about 278.5818859354.

Adding to 21620146 its reverse (64102612), we get a palindrome (85722758).

The spelling of 21620146 in words is "twenty-one million, six hundred twenty thousand, one hundred forty-six".