21121013102 has 16 divisors (see below), whose sum is σ = 36209674080. Its totient is φ = 9051307008.

The previous prime is 21121013099. The next prime is 21121013119. The reversal of 21121013102 is 20131012112.

It is a Harshad number since it is a multiple of its sum of digits (14).

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 7 ways as a sum of consecutive naturals, for example, 259478 + ... + 331014.

It is an arithmetic number, because the mean of its divisors is an integer number (2263104630).

Almost surely, 2^21121013102 is an apocalyptic number.

21121013102 is a deficient number, since it is larger than the sum of its proper divisors (15088660978).

21121013102 is a wasteful number, since it uses less digits than its factorization.

21121013102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92635.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21121013102 its reverse (20131012112), we get a palindrome (41252025214).

The spelling of 21121013102 in words is "twenty-one billion, one hundred twenty-one million, thirteen thousand, one hundred two".