21102046 has 32 divisors (see below), whose sum is σ = 38880000. Its totient is φ = 8562456.

The previous prime is 21102023. The next prime is 21102047. The reversal of 21102046 is 64020112.

It is a super-2 number, since 2×21102046² = 890592690772232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12225 + ... + 13843.

It is an arithmetic number, because the mean of its divisors is an integer number (1215000).

Almost surely, 2^21102046 is an apocalyptic number.

21102046 is a deficient number, since it is larger than the sum of its proper divisors (17777954).

21102046 is a wasteful number, since it uses less digits than its factorization.

21102046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661 (or 1647 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21102046 is about 4593.6963330198. The cubic root of 21102046 is about 276.3385801397.

Adding to 21102046 its reverse (64020112), we get a palindrome (85122158).

The spelling of 21102046 in words is "twenty-one million, one hundred two thousand, forty-six".