20210211101081 has 2 divisors, whose sum is σ = 20210211101082. Its totient is φ = 20210211101080.

The previous prime is 20210211101029. The next prime is 20210211101107. The reversal of 20210211101081 is 18010111201202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20147673595456 + 62537505625 = 4488616^2 + 250075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210211101081 is a prime.

It is a super-2 number, since 2×20210211101081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20210211103081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105105550540 + 10105105550541.

It is an arithmetic number, because the mean of its divisors is an integer number (10105105550541).

Almost surely, 2^{20210211101081} is an apocalyptic number.

It is an amenable number.

20210211101081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210211101081 is an equidigital number, since it uses as much as digits as its factorization.

20210211101081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 20210211101081 its reverse (18010111201202), we get a palindrome (38220322302283).

The spelling of 20210211101081 in words is "twenty trillion, two hundred ten billion, two hundred eleven million, one hundred one thousand, eighty-one".