20110211201997 has 64 divisors (see below), whose sum is σ = 35964772433920. Its totient is φ = 10862229470400.

The previous prime is 20110211201957. The next prime is 20110211202001. The reversal of 20110211201997 is 79910211201102.

It is not a de Polignac number, because 20110211201997 - 2¹⁴ = 20110211185613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110211201957) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39659254 + ... + 40163127.

It is an arithmetic number, because the mean of its divisors is an integer number (561949569280).

Almost surely, 2^{20110211201997} is an apocalyptic number.

20110211201997 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20110211201997 is a deficient number, since it is larger than the sum of its proper divisors (15854561231923).

20110211201997 is a wasteful number, since it uses less digits than its factorization.

20110211201997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79822471 (or 79822465 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 36.

The spelling of 20110211201997 in words is "twenty trillion, one hundred ten billion, two hundred eleven million, two hundred one thousand, nine hundred ninety-seven".