21626156 has 6 divisors (see below), whose sum is σ = 37845780. Its totient is φ = 10813076.

The previous prime is 21626153. The next prime is 21626179. The reversal of 21626156 is 65162612.

It is not an unprimeable number, because it can be changed into a prime (21626153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2703266 + ... + 2703273.

It is an arithmetic number, because the mean of its divisors is an integer number (6307630).

Almost surely, 2^21626156 is an apocalyptic number.

It is an amenable number.

21626156 is a deficient number, since it is larger than the sum of its proper divisors (16219624).

21626156 is a wasteful number, since it uses less digits than its factorization.

21626156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5406543 (or 5406541 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 21626156 is about 4650.3931016636. The cubic root of 21626156 is about 278.6076970780.

Adding to 21626156 its reverse (65162612), we get a palindrome (86788768).

The spelling of 21626156 in words is "twenty-one million, six hundred twenty-six thousand, one hundred fifty-six".