21010212102 has 32 divisors (see below), whose sum is σ = 46294343424. Its totient is φ = 6303692000.

The previous prime is 21010212073. The next prime is 21010212133. The reversal of 21010212102 is 20121201012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1569258 + ... + 1582589.

It is an arithmetic number, because the mean of its divisors is an integer number (1446698232).

Almost surely, 2^21010212102 is an apocalyptic number.

21010212102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21010212102 is an abundant number, since it is smaller than the sum of its proper divisors (25284131322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21010212102 is a wasteful number, since it uses less digits than its factorization.

21010212102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3151964.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21010212102 its reverse (20121201012), we get a palindrome (41131413114).

The spelling of 21010212102 in words is "twenty-one billion, ten million, two hundred twelve thousand, one hundred two".