10101111421 has 2 divisors, whose sum is σ = 10101111422. Its totient is φ = 10101111420.

The previous prime is 10101111409. The next prime is 10101111439. The reversal of 10101111421 is 12411110101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9225602500 + 875508921 = 96050^2 + 29589^2 .

It is a cyclic number.

It is not a de Polignac number, because 10101111421 - 2⁵ = 10101111389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10101111491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050555710 + 5050555711.

It is an arithmetic number, because the mean of its divisors is an integer number (5050555711).

Almost surely, 2^10101111421 is an apocalyptic number.

It is an amenable number.

10101111421 is a deficient number, since it is larger than the sum of its proper divisors (1).

10101111421 is an equidigital number, since it uses as much as digits as its factorization.

10101111421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 10101111421 its reverse (12411110101), we get a palindrome (22512221522).

The spelling of 10101111421 in words is "ten billion, one hundred one million, one hundred eleven thousand, four hundred twenty-one".