21121201102 has 4 divisors (see below), whose sum is σ = 31681801656. Its totient is φ = 10560600550.

The previous prime is 21121201099. The next prime is 21121201109. The reversal of 21121201102 is 20110212112.

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

It is a super-2 number, since 2×21121201102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121201109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280300274 + ... + 5280300277.

It is an arithmetic number, because the mean of its divisors is an integer number (7920450414).

Almost surely, 2^21121201102 is an apocalyptic number.

21121201102 is a deficient number, since it is larger than the sum of its proper divisors (10560600554).

21121201102 is a wasteful number, since it uses less digits than its factorization.

21121201102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560600553.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21121201102 its reverse (20110212112), we get a palindrome (41231413214).

The spelling of 21121201102 in words is "twenty-one billion, one hundred twenty-one million, two hundred one thousand, one hundred two".