21121444102 has 32 divisors (see below), whose sum is σ = 35724499200. Its totient is φ = 9283178400.

The previous prime is 21121444067. The next prime is 21121444129. The reversal of 21121444102 is 20144412112.

It is a super-2 number, since 2×21121444102² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 15 ways as a sum of consecutive naturals, for example, 54202 + ... + 212557.

It is an arithmetic number, because the mean of its divisors is an integer number (1116390600).

Almost surely, 2^21121444102 is an apocalyptic number.

21121444102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21121444102 is a deficient number, since it is larger than the sum of its proper divisors (14603055098).

21121444102 is a wasteful number, since it uses less digits than its factorization.

21121444102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266892.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21121444102 its reverse (20144412112), we get a palindrome (41265856214).

The spelling of 21121444102 in words is "twenty-one billion, one hundred twenty-one million, four hundred forty-four thousand, one hundred two".