1021427901811 has 4 divisors (see below), whose sum is σ = 1022095067224. Its totient is φ = 1020760736400.

The previous prime is 1021427901763. The next prime is 1021427901817. The reversal of 1021427901811 is 1181097241201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021427901811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021427901817) 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, 333580410 + ... + 333583471.

It is an arithmetic number, because the mean of its divisors is an integer number (255523766806).

Almost surely, 2^{1021427901811} is an apocalyptic number.

1021427901811 is a deficient number, since it is larger than the sum of its proper divisors (667165413).

1021427901811 is an equidigital number, since it uses as much as digits as its factorization.

1021427901811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667165412.

The product of its (nonzero) digits is 8064, while the sum is 37.

The spelling of 1021427901811 in words is "one trillion, twenty-one billion, four hundred twenty-seven million, nine hundred one thousand, eight hundred eleven".