211121011202021 has 4 divisors (see below), whose sum is σ = 211213893303372. Its totient is φ = 211028129100672.

The previous prime is 211121011201949. The next prime is 211121011202033. The reversal of 211121011202021 is 120202110121112.

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 147571814551396 + 63549196650625 = 12147914^2 + 7971775^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121011202021 - 2¹⁸ = 211121010939877 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 (211121011204021) 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, 46441047266 + ... + 46441051811.

It is an arithmetic number, because the mean of its divisors is an integer number (52803473325843).

Almost surely, 2^{211121011202021} is an apocalyptic number.

It is an amenable number.

211121011202021 is a deficient number, since it is larger than the sum of its proper divisors (92882101351).

211121011202021 is an equidigital number, since it uses as much as digits as its factorization.

211121011202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92882101350.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211121011202021 its reverse (120202110121112), we get a palindrome (331323121323133).

The spelling of 211121011202021 in words is "two hundred eleven trillion, one hundred twenty-one billion, eleven million, two hundred two thousand, twenty-one".