212021121101 has 12 divisors (see below), whose sum is σ = 229371064668. Its totient is φ = 195303526272.

The previous prime is 212021121097. The next prime is 212021121107. The reversal of 212021121101 is 101121120212.

It can be written as a sum of positive squares in 2 ways, for example, as 188803285225 + 23217835876 = 434515^2 + 152374^2 .

It is not a de Polignac number, because 212021121101 - 2² = 212021121097 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 (212021121107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2785406 + ... + 2860511.

It is an arithmetic number, because the mean of its divisors is an integer number (19114255389).

Almost surely, 2^212021121101 is an apocalyptic number.

It is an amenable number.

212021121101 is a deficient number, since it is larger than the sum of its proper divisors (17349943567).

212021121101 is an equidigital number, since it uses as much as digits as its factorization.

212021121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5646028 (or 5645981 counting only the distinct ones).

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

Adding to 212021121101 its reverse (101121120212), we get a palindrome (313142241313).

The spelling of 212021121101 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, one hundred one".