211020011012021 has 4 divisors (see below), whose sum is σ = 213691150392000. Its totient is φ = 208348871632044.

The previous prime is 211020011011993. The next prime is 211020011012053. The reversal of 211020011012021 is 120210110020112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211020011012021 - 2¹⁴ = 211020010995637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211020011011987 and 211020011012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020011012221) 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, 1335569689871 + ... + 1335569690028.

It is an arithmetic number, because the mean of its divisors is an integer number (53422787598000).

Almost surely, 2^{211020011012021} is an apocalyptic number.

It is an amenable number.

211020011012021 is a deficient number, since it is larger than the sum of its proper divisors (2671139379979).

211020011012021 is an equidigital number, since it uses as much as digits as its factorization.

211020011012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671139379978.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 211020011012021 its reverse (120210110020112), we get a palindrome (331230121032133).

The spelling of 211020011012021 in words is "two hundred eleven trillion, twenty billion, eleven million, twelve thousand, twenty-one".