21123310102 has 8 divisors (see below), whose sum is σ = 31926835512. Its totient is φ = 10481031600.

The previous prime is 21123310073. The next prime is 21123310111. The reversal of 21123310102 is 20101332112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40311399 + ... + 40311922.

It is an arithmetic number, because the mean of its divisors is an integer number (3990854439).

Almost surely, 2^21123310102 is an apocalyptic number.

21123310102 is a deficient number, since it is larger than the sum of its proper divisors (10803525410).

21123310102 is a wasteful number, since it uses less digits than its factorization.

21123310102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80623454.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21123310102 its reverse (20101332112), we get a palindrome (41224642214).

The spelling of 21123310102 in words is "twenty-one billion, one hundred twenty-three million, three hundred ten thousand, one hundred two".