21106502 has 16 divisors (see below), whose sum is σ = 33931872. Its totient is φ = 9820800.

The previous prime is 21106471. The next prime is 21106523. The reversal of 21106502 is 20560112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4499 + ... + 7902.

It is an arithmetic number, because the mean of its divisors is an integer number (2120742).

Almost surely, 2^21106502 is an apocalyptic number.

21106502 is a deficient number, since it is larger than the sum of its proper divisors (12825370).

21106502 is a wasteful number, since it uses less digits than its factorization.

21106502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12463.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21106502 is about 4594.1813198871. The cubic root of 21106502 is about 276.3580297237.

Adding to 21106502 its reverse (20560112), we get a palindrome (41666614).

The spelling of 21106502 in words is "twenty-one million, one hundred six thousand, five hundred two".