21110156 has 6 divisors (see below), whose sum is σ = 36942780. Its totient is φ = 10555076.

The previous prime is 21110149. The next prime is 21110179. The reversal of 21110156 is 65101112.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638766 + ... + 2638773.

It is an arithmetic number, because the mean of its divisors is an integer number (6157130).

Almost surely, 2^21110156 is an apocalyptic number.

It is an amenable number.

21110156 is a deficient number, since it is larger than the sum of its proper divisors (15832624).

21110156 is a wasteful number, since it uses less digits than its factorization.

21110156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5277543 (or 5277541 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 21110156 is about 4594.5789796237. The cubic root of 21110156 is about 276.3739766891.

Adding to 21110156 its reverse (65101112), we get a palindrome (86211268).

The spelling of 21110156 in words is "twenty-one million, one hundred ten thousand, one hundred fifty-six".