21121002224 has 40 divisors (see below), whose sum is σ = 49229408640. Its totient is φ = 8575443648.

The previous prime is 21121002211. The next prime is 21121002233. The reversal of 21121002224 is 42220012112.

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, 4960514 + ... + 4964769.

It is an arithmetic number, because the mean of its divisors is an integer number (1230735216).

Almost surely, 2^21121002224 is an apocalyptic number.

It is an amenable number.

21121002224 is an abundant number, since it is smaller than the sum of its proper divisors (28108406416).

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

21121002224 is a wasteful number, since it uses less digits than its factorization.

21121002224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9925317 (or 9925311 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21121002224 its reverse (42220012112), we get a palindrome (63341014336).

The spelling of 21121002224 in words is "twenty-one billion, one hundred twenty-one million, two thousand, two hundred twenty-four".