1021021200077 has 2 divisors, whose sum is σ = 1021021200078. Its totient is φ = 1021021200076.

The previous prime is 1021021200011. The next prime is 1021021200079. The reversal of 1021021200077 is 7700021201201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 977604810121 + 43416389956 = 988739^2 + 208366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021021200077 is a prime.

Together with 1021021200079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021021200079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510510600038 + 510510600039.

It is an arithmetic number, because the mean of its divisors is an integer number (510510600039).

Almost surely, 2^{1021021200077} is an apocalyptic number.

It is an amenable number.

1021021200077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021021200077 is an equidigital number, since it uses as much as digits as its factorization.

1021021200077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 23.

Adding to 1021021200077 its reverse (7700021201201), we get a palindrome (8721042401278).

The spelling of 1021021200077 in words is "one trillion, twenty-one billion, twenty-one million, two hundred thousand, seventy-seven".