1220121120021 has 8 divisors (see below), whose sum is σ = 1626834484704. Its totient is φ = 813410917680.

The previous prime is 1220121119989. The next prime is 1220121120089. The reversal of 1220121120021 is 1200211210221.

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

It is not a de Polignac number, because 1220121120021 - 2⁵ = 1220121119989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220121120521) 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, 341110 + ... + 1598936.

It is an arithmetic number, because the mean of its divisors is an integer number (203354310588).

Almost surely, 2^{1220121120021} is an apocalyptic number.

It is an amenable number.

1220121120021 is a deficient number, since it is larger than the sum of its proper divisors (406713364683).

1220121120021 is a wasteful number, since it uses less digits than its factorization.

1220121120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581171.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1220121120021 its reverse (1200211210221), we get a palindrome (2420332330242).

The spelling of 1220121120021 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twenty thousand, twenty-one".