21120212102 has 32 divisors (see below), whose sum is σ = 35163777024. Its totient is φ = 9433454400.

The previous prime is 21120212027. The next prime is 21120212129. The reversal of 21120212102 is 20121202112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 410963 + ... + 459489.

It is an arithmetic number, because the mean of its divisors is an integer number (1098868032).

Almost surely, 2^21120212102 is an apocalyptic number.

21120212102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21120212102 is a deficient number, since it is larger than the sum of its proper divisors (14043564922).

21120212102 is a wasteful number, since it uses less digits than its factorization.

21120212102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48884.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21120212102 its reverse (20121202112), we get a palindrome (41241414214).

The spelling of 21120212102 in words is "twenty-one billion, one hundred twenty million, two hundred twelve thousand, one hundred two".