20403121011 has 32 divisors (see below), whose sum is σ = 34386981888. Its totient is φ = 10471213440.

The previous prime is 20403120989. The next prime is 20403121043. The reversal of 20403121011 is 11012130402.

It is not a de Polignac number, because 20403121011 - 2⁹ = 20403120499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20403121051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 999855 + ... + 1020056.

It is an arithmetic number, because the mean of its divisors is an integer number (1074593184).

Almost surely, 2^20403121011 is an apocalyptic number.

20403121011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20403121011 is a deficient number, since it is larger than the sum of its proper divisors (13983860877).

20403121011 is a wasteful number, since it uses less digits than its factorization.

20403121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019971.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20403121011 its reverse (11012130402), we get a palindrome (31415251413).

The spelling of 20403121011 in words is "twenty billion, four hundred three million, one hundred twenty-one thousand, eleven".