1021012100191 has 4 divisors (see below), whose sum is σ = 1045914834384. Its totient is φ = 996109366000.

The previous prime is 1021012100159. The next prime is 1021012100201. The reversal of 1021012100191 is 1910012101201.

1021012100191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021012100191 - 2⁵ = 1021012100159 is a prime.

It is a super-4 number, since 4×1021012100191⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021012100291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12451367035 + ... + 12451367116.

It is an arithmetic number, because the mean of its divisors is an integer number (261478708596).

Almost surely, 2^{1021012100191} is an apocalyptic number.

1021012100191 is a deficient number, since it is larger than the sum of its proper divisors (24902734193).

1021012100191 is an equidigital number, since it uses as much as digits as its factorization.

1021012100191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24902734192.

The product of its (nonzero) digits is 36, while the sum is 19.

Adding to 1021012100191 its reverse (1910012101201), we get a palindrome (2931024201392).

The spelling of 1021012100191 in words is "one trillion, twenty-one billion, twelve million, one hundred thousand, one hundred ninety-one".