21121030161352 has 32 divisors (see below), whose sum is σ = 44595723513600. Its totient is φ = 9290775729600.

The previous prime is 21121030161349. The next prime is 21121030161373. The reversal of 21121030161352 is 25316103012112.

It is a self number, because there is not a number n which added to its sum of digits gives 21121030161352.

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, 3871153827 + ... + 3871159282.

It is an arithmetic number, because the mean of its divisors is an integer number (1393616359800).

Almost surely, 2^{21121030161352} is an apocalyptic number.

21121030161352 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21121030161352 is an abundant number, since it is smaller than the sum of its proper divisors (23474693352248).

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

21121030161352 is a wasteful number, since it uses less digits than its factorization.

21121030161352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7742313157 (or 7742313153 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 21121030161352 its reverse (25316103012112), we get a palindrome (46437133173464).

The spelling of 21121030161352 in words is "twenty-one trillion, one hundred twenty-one billion, thirty million, one hundred sixty-one thousand, three hundred fifty-two".