21121101202 has 4 divisors (see below), whose sum is σ = 31681651806. Its totient is φ = 10560550600.

The previous prime is 21121101173. The next prime is 21121101247. The reversal of 21121101202 is 20210112112.

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

It can be written as a sum of positive squares in only one way, i.e., 20155196961 + 965904241 = 141969^2 + 31079^2 .

It is a super-2 number, since 2×21121101202² (a number of 21 digits) contains 22 as substring.

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 as a sum of consecutive naturals, namely, 5280275299 + ... + 5280275302.

Almost surely, 2^21121101202 is an apocalyptic number.

21121101202 is a deficient number, since it is larger than the sum of its proper divisors (10560550604).

21121101202 is a wasteful number, since it uses less digits than its factorization.

21121101202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560550603.

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

Adding to 21121101202 its reverse (20210112112), we get a palindrome (41331213314).

The spelling of 21121101202 in words is "twenty-one billion, one hundred twenty-one million, one hundred one thousand, two hundred two".