1211121202021 has 8 divisors (see below), whose sum is σ = 1277195082080. Its totient is φ = 1145280387888.

The previous prime is 1211121201991. The next prime is 1211121202043. The reversal of 1211121202021 is 1202021211121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211121202021 - 2⁷ = 1211121201893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211121201986 and 1211121202004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211121206021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58255806 + ... + 58276591.

It is an arithmetic number, because the mean of its divisors is an integer number (159649385260).

Almost surely, 2^{1211121202021} is an apocalyptic number.

It is an amenable number.

1211121202021 is a deficient number, since it is larger than the sum of its proper divisors (66073880059).

1211121202021 is a wasteful number, since it uses less digits than its factorization.

1211121202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116532963.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211121202021 its reverse (1202021211121), we get a palindrome (2413142413142).

The spelling of 1211121202021 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred two thousand, twenty-one".