212210202021121 has 4 divisors (see below), whose sum is σ = 217386060607044. Its totient is φ = 207034343435200.

The previous prime is 212210202021113. The next prime is 212210202021131. The reversal of 212210202021121 is 121120202012212.

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 105176921136400 + 107033280884721 = 10255580^2 + 10345689^2 .

It is a cyclic number.

It is not a de Polignac number, because 212210202021121 - 2³ = 212210202021113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212210202021101) 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, 2587929292900 + ... + 2587929292981.

It is an arithmetic number, because the mean of its divisors is an integer number (54346515151761).

Almost surely, 2^{212210202021121} is an apocalyptic number.

It is an amenable number.

212210202021121 is a deficient number, since it is larger than the sum of its proper divisors (5175858585923).

212210202021121 is an equidigital number, since it uses as much as digits as its factorization.

212210202021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5175858585922.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212210202021121 its reverse (121120202012212), we get a palindrome (333330404033333).

The spelling of 212210202021121 in words is "two hundred twelve trillion, two hundred ten billion, two hundred two million, twenty-one thousand, one hundred twenty-one".