1021100984557 has 2 divisors, whose sum is σ = 1021100984558. Its totient is φ = 1021100984556.

The previous prime is 1021100984543. The next prime is 1021100984567. The reversal of 1021100984557 is 7554890011201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1003414910436 + 17686074121 = 1001706^2 + 132989^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021100984557 - 2²³ = 1021092595949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021100984507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510550492278 + 510550492279.

It is an arithmetic number, because the mean of its divisors is an integer number (510550492279).

Almost surely, 2^{1021100984557} is an apocalyptic number.

It is an amenable number.

1021100984557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021100984557 is an equidigital number, since it uses as much as digits as its factorization.

1021100984557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 43.

Adding to 1021100984557 its reverse (7554890011201), we get a palindrome (8575990995758).

The spelling of 1021100984557 in words is "one trillion, twenty-one billion, one hundred million, nine hundred eighty-four thousand, five hundred fifty-seven".