21000513411 has 8 divisors (see below), whose sum is σ = 31111871760. Its totient is φ = 14000342256.

The previous prime is 21000513397. The next prime is 21000513431. The reversal of 21000513411 is 11431500012.

It is not a de Polignac number, because 21000513411 - 2⁷ = 21000513283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21000513431) by changing a digit.

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, 388898370 + ... + 388898423.

It is an arithmetic number, because the mean of its divisors is an integer number (3888983970).

Almost surely, 2^21000513411 is an apocalyptic number.

21000513411 is a deficient number, since it is larger than the sum of its proper divisors (10111358349).

21000513411 is an equidigital number, since it uses as much as digits as its factorization.

21000513411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777796802 (or 777796796 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The spelling of 21000513411 in words is "twenty-one billion, five hundred thirteen thousand, four hundred eleven".