21012221102 has 8 divisors (see below), whose sum is σ = 33372351216. Its totient is φ = 9888104032.

The previous prime is 21012221059. The next prime is 21012221171. The reversal of 21012221102 is 20112221012.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309003218 + ... + 309003285.

It is an arithmetic number, because the mean of its divisors is an integer number (4171543902).

Almost surely, 2^21012221102 is an apocalyptic number.

21012221102 is a deficient number, since it is larger than the sum of its proper divisors (12360130114).

21012221102 is a wasteful number, since it uses less digits than its factorization.

21012221102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618006522.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21012221102 its reverse (20112221012), we get a palindrome (41124442114).

The spelling of 21012221102 in words is "twenty-one billion, twelve million, two hundred twenty-one thousand, one hundred two".