21010102 has 8 divisors (see below), whose sum is σ = 31553496. Its totient is φ = 10492272.

The previous prime is 21010097. The next prime is 21010111. The reversal of 21010102 is 20101012.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4183 + ... + 7714.

It is an arithmetic number, because the mean of its divisors is an integer number (3944187).

Almost surely, 2^21010102 is an apocalyptic number.

21010102 is a deficient number, since it is larger than the sum of its proper divisors (10543394).

21010102 is a wasteful number, since it uses less digits than its factorization.

21010102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12782.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 21010102 is about 4583.6777809964. The cubic root of 21010102 is about 275.9366496765.

Adding to 21010102 its reverse (20101012), we get a palindrome (41111114).

It can be divided in two parts, 2101010 and 2, that added together give a palindrome (2101012).

The spelling of 21010102 in words is "twenty-one million, ten thousand, one hundred two".