21121346404356 has 24 divisors (see below), whose sum is σ = 53763427211424. Its totient is φ = 6400408001280.

The previous prime is 21121346404343. The next prime is 21121346404387. The reversal of 21121346404356 is 65340464312112.

It is a super-2 number, since 2×21121346404356² (a number of 27 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 80005099885 + ... + 80005100148.

It is an arithmetic number, because the mean of its divisors is an integer number (2240142800476).

Almost surely, 2^{21121346404356} is an apocalyptic number.

It is an amenable number.

21121346404356 is an abundant number, since it is smaller than the sum of its proper divisors (32642080807068).

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

21121346404356 is a wasteful number, since it uses less digits than its factorization.

21121346404356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160010200051 (or 160010200049 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 21121346404356 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred forty-six million, four hundred four thousand, three hundred fifty-six".