21121140613220 has 48 divisors (see below), whose sum is σ = 44470649196288. Its totient is φ = 8426324417280.

The previous prime is 21121140613201. The next prime is 21121140613231. The reversal of 21121140613220 is 2231604112112.

It is a happy number.

It is a super-2 number, since 2×21121140613220² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121140613220.

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, 28485104 + ... + 29217176.

It is an arithmetic number, because the mean of its divisors is an integer number (926471858256).

Almost surely, 2^{21121140613220} is an apocalyptic number.

21121140613220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121140613220 is an abundant number, since it is smaller than the sum of its proper divisors (23349508583068).

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

21121140613220 is a wasteful number, since it uses less digits than its factorization.

21121140613220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735860 (or 735858 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

Adding to 21121140613220 its reverse (2231604112112), we get a palindrome (23352744725332).

The spelling of 21121140613220 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred forty million, six hundred thirteen thousand, two hundred twenty".