1212211322021 has 16 divisors (see below), whose sum is σ = 1404026265600. Its totient is φ = 1025091684528.

The previous prime is 1212211322017. The next prime is 1212211322027. The reversal of 1212211322021 is 1202231122121.

It is a cyclic number.

It is not a de Polignac number, because 1212211322021 - 2² = 1212211322017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212211321984 and 1212211322002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212211322027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1033181 + ... + 1868658.

It is an arithmetic number, because the mean of its divisors is an integer number (87751641600).

Almost surely, 2^{1212211322021} is an apocalyptic number.

It is an amenable number.

1212211322021 is a deficient number, since it is larger than the sum of its proper divisors (191814943579).

1212211322021 is an equidigital number, since it uses as much as digits as its factorization.

1212211322021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902648.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1212211322021 its reverse (1202231122121), we get a palindrome (2414442444142).

The spelling of 1212211322021 in words is "one trillion, two hundred twelve billion, two hundred eleven million, three hundred twenty-two thousand, twenty-one".