21012222102 has 64 divisors (see below), whose sum is σ = 45265651200. Its totient is φ = 6486022400.

The previous prime is 21012222059. The next prime is 21012222109. The reversal of 21012222102 is 20122221012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012222109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 727024 + ... + 755372.

It is an arithmetic number, because the mean of its divisors is an integer number (707275800).

Almost surely, 2^21012222102 is an apocalyptic number.

21012222102 is an abundant number, since it is smaller than the sum of its proper divisors (24253429098).

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

21012222102 is a wasteful number, since it uses less digits than its factorization.

21012222102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28549.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21012222102 its reverse (20122221012), we get a palindrome (41134443114).

The spelling of 21012222102 in words is "twenty-one billion, twelve million, two hundred twenty-two thousand, one hundred two".