1021979464901 has 4 divisors (see below), whose sum is σ = 1021983337452. Its totient is φ = 1021975592352.

The previous prime is 1021979464897. The next prime is 1021979464907. The reversal of 1021979464901 is 1094649791201.

It is a happy number.

It is a Cunningham number, because it is equal to 1010930²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 593864431876 + 428115033025 = 770626^2 + 654305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021979464901 - 2² = 1021979464897 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021979464907) 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, 1508990 + ... + 2078703.

It is an arithmetic number, because the mean of its divisors is an integer number (255495834363).

Almost surely, 2^{1021979464901} is an apocalyptic number.

It is an amenable number.

1021979464901 is a deficient number, since it is larger than the sum of its proper divisors (3872551).

1021979464901 is an equidigital number, since it uses as much as digits as its factorization.

1021979464901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872550.

The product of its (nonzero) digits is 979776, while the sum is 53.

The spelling of 1021979464901 in words is "one trillion, twenty-one billion, nine hundred seventy-nine million, four hundred sixty-four thousand, nine hundred one".