21121000352456 has 16 divisors (see below), whose sum is σ = 39601983673500. Its totient is φ = 10560471372864.

The previous prime is 21121000352393. The next prime is 21121000352467. The reversal of 21121000352456 is 65425300012112.

It can be written as a sum of positive squares in 2 ways, for example, as 16051000576900 + 5069999775556 = 4006370^2 + 2251666^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306731 + ... + 6506618.

Almost surely, 2^{21121000352456} is an apocalyptic number.

It is an amenable number.

21121000352456 is a deficient number, since it is larger than the sum of its proper divisors (18480983321044).

21121000352456 is a wasteful number, since it uses less digits than its factorization.

21121000352456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7200848 (or 7200844 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21121000352456 its reverse (65425300012112), we get a palindrome (86546300364568).

The spelling of 21121000352456 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred fifty-two thousand, four hundred fifty-six".