1213220121021 has 12 divisors (see below), whose sum is σ = 1752955204000. Its totient is φ = 808570580040.

The previous prime is 1213220121013. The next prime is 1213220121031. The reversal of 1213220121021 is 1201210223121.

1213220121021 is a `hidden beast` number, since 1 + 213 + 220 + 1 + 210 + 21 = 666.

It is not a de Polignac number, because 1213220121021 - 2³ = 1213220121013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213220120985 and 1213220121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213220121031) 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, 20204521 + ... + 20264478.

Almost surely, 2^{1213220121021} is an apocalyptic number.

It is an amenable number.

1213220121021 is a deficient number, since it is larger than the sum of its proper divisors (539735082979).

1213220121021 is a wasteful number, since it uses less digits than its factorization.

1213220121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40472336 (or 40472333 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1213220121021 its reverse (1201210223121), we get a palindrome (2414430344142).

The spelling of 1213220121021 in words is "one trillion, two hundred thirteen billion, two hundred twenty million, one hundred twenty-one thousand, twenty-one".