2021125572491 has 2 divisors, whose sum is σ = 2021125572492. Its totient is φ = 2021125572490.

The previous prime is 2021125572481. The next prime is 2021125572523. The reversal of 2021125572491 is 1942755211202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021125572491 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021125572481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010562786245 + 1010562786246.

It is an arithmetic number, because the mean of its divisors is an integer number (1010562786246).

Almost surely, 2^{2021125572491} is an apocalyptic number.

2021125572491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021125572491 is an equidigital number, since it uses as much as digits as its factorization.

2021125572491 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 41.

The spelling of 2021125572491 in words is "two trillion, twenty-one billion, one hundred twenty-five million, five hundred seventy-two thousand, four hundred ninety-one".