21221112410 has 64 divisors (see below), whose sum is σ = 41872453632. Its totient is φ = 7711819776.

The previous prime is 21221112383. The next prime is 21221112421. The reversal of 21221112410 is 1421112212.

It is a super-2 number, since 2×21221112410² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 31 ways as a sum of consecutive naturals, for example, 565079 + ... + 601461.

It is an arithmetic number, because the mean of its divisors is an integer number (654257088).

Almost surely, 2^21221112410 is an apocalyptic number.

21221112410 is a deficient number, since it is larger than the sum of its proper divisors (20651341222).

21221112410 is a wasteful number, since it uses less digits than its factorization.

21221112410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36527.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21221112410 its reverse (1421112212), we get a palindrome (22642224622).

The spelling of 21221112410 in words is "twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, four hundred ten".