20111121478 has 32 divisors (see below), whose sum is σ = 36852641280. Its totient is φ = 8043224640.

The previous prime is 20111121469. The next prime is 20111121479. The reversal of 20111121478 is 87412111102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111121479) 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 15 ways as a sum of consecutive naturals, for example, 748468 + ... + 774871.

It is an arithmetic number, because the mean of its divisors is an integer number (1151645040).

Almost surely, 2^20111121478 is an apocalyptic number.

20111121478 is a deficient number, since it is larger than the sum of its proper divisors (16741519802).

20111121478 is a wasteful number, since it uses less digits than its factorization.

20111121478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523412.

The product of its (nonzero) digits is 896, while the sum is 28.

The spelling of 20111121478 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, four hundred seventy-eight".