21120010102 has 4 divisors (see below), whose sum is σ = 31680015156. Its totient is φ = 10560005050.

The previous prime is 21120010097. The next prime is 21120010127. The reversal of 21120010102 is 20101002112.

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

It is a super-3 number, since 3×21120010102³ (a number of 32 digits) contains 333 as substring.

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, 5280002524 + ... + 5280002527.

It is an arithmetic number, because the mean of its divisors is an integer number (7920003789).

Almost surely, 2^21120010102 is an apocalyptic number.

21120010102 is a deficient number, since it is larger than the sum of its proper divisors (10560005054).

21120010102 is a wasteful number, since it uses less digits than its factorization.

21120010102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560005053.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21120010102 its reverse (20101002112), we get a palindrome (41221012214).

The spelling of 21120010102 in words is "twenty-one billion, one hundred twenty million, ten thousand, one hundred two".