2021011121953 has 2 divisors, whose sum is σ = 2021011121954. Its totient is φ = 2021011121952.

The previous prime is 2021011121951. The next prime is 2021011121989. The reversal of 2021011121953 is 3591211101202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1800794911969 + 220216209984 = 1341937^2 + 469272^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021011121953 - 2¹ = 2021011121951 is a prime.

Together with 2021011121951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2021011121951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010505560976 + 1010505560977.

It is an arithmetic number, because the mean of its divisors is an integer number (1010505560977).

Almost surely, 2^{2021011121953} is an apocalyptic number.

It is an amenable number.

2021011121953 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021011121953 is an equidigital number, since it uses as much as digits as its factorization.

2021011121953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 28.

The spelling of 2021011121953 in words is "two trillion, twenty-one billion, eleven million, one hundred twenty-one thousand, nine hundred fifty-three".