20111229031 has 2 divisors, whose sum is σ = 20111229032. Its totient is φ = 20111229030.

The previous prime is 20111228989. The next prime is 20111229059. The reversal of 20111229031 is 13092211102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20111229031 - 2²¹ = 20109131879 is a prime.

It is a super-2 number, since 2×20111229031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20111228993 and 20111229011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111209031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055614515 + 10055614516.

It is an arithmetic number, because the mean of its divisors is an integer number (10055614516).

Almost surely, 2^20111229031 is an apocalyptic number.

20111229031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111229031 is an equidigital number, since it uses as much as digits as its factorization.

20111229031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 20111229031 in words is "twenty billion, one hundred eleven million, two hundred twenty-nine thousand, thirty-one".