211001200111021 has 4 divisors (see below), whose sum is σ = 211320415240444. Its totient is φ = 210681984981600.

The previous prime is 211001200110979. The next prime is 211001200111139. The reversal of 211001200111021 is 120111002100112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 168258515102500 + 42742685008521 = 12971450^2 + 6537789^2 .

It is a cyclic number.

It is not a de Polignac number, because 211001200111021 - 2⁹ = 211001200110509 is a prime.

It is a super-2 number, since 2×211001200111021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211001200110992 and 211001200111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211001200111421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159607563720 + ... + 159607565041.

It is an arithmetic number, because the mean of its divisors is an integer number (52830103810111).

Almost surely, 2^{211001200111021} is an apocalyptic number.

It is an amenable number.

211001200111021 is a deficient number, since it is larger than the sum of its proper divisors (319215129423).

211001200111021 is an equidigital number, since it uses as much as digits as its factorization.

211001200111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319215129422.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211001200111021 its reverse (120111002100112), we get a palindrome (331112202211133).

The spelling of 211001200111021 in words is "two hundred eleven trillion, one billion, two hundred million, one hundred eleven thousand, twenty-one".