21011012102 has 4 divisors (see below), whose sum is σ = 31516518156. Its totient is φ = 10505506050.

The previous prime is 21011012089. The next prime is 21011012119. The reversal of 21011012102 is 20121011012.

21011012102 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252753024 + ... + 5252753027.

It is an arithmetic number, because the mean of its divisors is an integer number (7879129539).

Almost surely, 2^21011012102 is an apocalyptic number.

21011012102 is a deficient number, since it is larger than the sum of its proper divisors (10505506054).

21011012102 is a wasteful number, since it uses less digits than its factorization.

21011012102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10505506053.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21011012102 its reverse (20121011012), we get a palindrome (41132023114).

The spelling of 21011012102 in words is "twenty-one billion, eleven million, twelve thousand, one hundred two".