2100420031 has 2 divisors, whose sum is σ = 2100420032. Its totient is φ = 2100420030.

The previous prime is 2100420029. The next prime is 2100420041. The reversal of 2100420031 is 1300240012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2100420031 - 2¹ = 2100420029 is a prime.

It is a super-2 number, since 2×2100420031² = 8823528613252081922, which contains 22 as substring.

Together with 2100420029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2100419993 and 2100420020.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100420041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050210015 + 1050210016.

It is an arithmetic number, because the mean of its divisors is an integer number (1050210016).

Almost surely, 2^2100420031 is an apocalyptic number.

2100420031 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100420031 is an equidigital number, since it uses as much as digits as its factorization.

2100420031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2100420031 is about 45830.3396343514. The cubic root of 2100420031 is about 1280.6645375414.

Adding to 2100420031 its reverse (1300240012), we get a palindrome (3400660043).

The spelling of 2100420031 in words is "two billion, one hundred million, four hundred twenty thousand, thirty-one".