20111121479 has 2 divisors, whose sum is σ = 20111121480. Its totient is φ = 20111121478.

The previous prime is 20111121469. The next prime is 20111121493. The reversal of 20111121479 is 97412111102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111121479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111121469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055560739 + 10055560740.

It is an arithmetic number, because the mean of its divisors is an integer number (10055560740).

Almost surely, 2^20111121479 is an apocalyptic number.

20111121479 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111121479 is an equidigital number, since it uses as much as digits as its factorization.

20111121479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 29.

The spelling of 20111121479 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, four hundred seventy-nine".