20001121031 has 2 divisors, whose sum is σ = 20001121032. Its totient is φ = 20001121030.

The previous prime is 20001120977. The next prime is 20001121037. The reversal of 20001121031 is 13012110002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20001121031 - 2⁶ = 20001120967 is a prime.

It is a super-2 number, since 2×20001121031² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001121037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000560515 + 10000560516.

It is an arithmetic number, because the mean of its divisors is an integer number (10000560516).

Almost surely, 2^20001121031 is an apocalyptic number.

20001121031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001121031 is an equidigital number, since it uses as much as digits as its factorization.

20001121031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20001121031 its reverse (13012110002), we get a palindrome (33013231033).

The spelling of 20001121031 in words is "twenty billion, one million, one hundred twenty-one thousand, thirty-one".