21144423102 has 32 divisors (see below), whose sum is σ = 47724094080. Its totient is φ = 6186455520.

The previous prime is 21144423061. The next prime is 21144423119. The reversal of 21144423102 is 20132444112.

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, 5521708 + ... + 5525535.

It is an arithmetic number, because the mean of its divisors is an integer number (1491377940).

Almost surely, 2^21144423102 is an apocalyptic number.

21144423102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21144423102 is an abundant number, since it is smaller than the sum of its proper divisors (26579670978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21144423102 is a wasteful number, since it uses less digits than its factorization.

21144423102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11047288.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21144423102 its reverse (20132444112), we get a palindrome (41276867214).

The spelling of 21144423102 in words is "twenty-one billion, one hundred forty-four million, four hundred twenty-three thousand, one hundred two".