21011221102 has 16 divisors (see below), whose sum is σ = 32163972480. Its totient is φ = 10290544992.

The previous prime is 21011221097. The next prime is 21011221129. The reversal of 21011221102 is 20112211012.

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, 96702 + ... + 226657.

It is an arithmetic number, because the mean of its divisors is an integer number (2010248280).

Almost surely, 2^21011221102 is an apocalyptic number.

21011221102 is a deficient number, since it is larger than the sum of its proper divisors (11152751378).

21011221102 is a wasteful number, since it uses less digits than its factorization.

21011221102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324027.

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

Adding to 21011221102 its reverse (20112211012), we get a palindrome (41123432114).

The spelling of 21011221102 in words is "twenty-one billion, eleven million, two hundred twenty-one thousand, one hundred two".