1220011202021 has 6 divisors (see below), whose sum is σ = 1250493339666. Its totient is φ = 1190254829600.

The previous prime is 1220011201993. The next prime is 1220011202147. The reversal of 1220011202021 is 1202021100221.

It can be written as a sum of positive squares in 3 ways, for example, as 59457457921 + 1160553744100 = 243839^2 + 1077290^2 .

It is not a de Polignac number, because 1220011202021 - 2¹⁰ = 1220011200997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220011201987 and 1220011202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220011202321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 362880890 + ... + 362884251.

It is an arithmetic number, because the mean of its divisors is an integer number (208415556611).

Almost surely, 2^{1220011202021} is an apocalyptic number.

It is an amenable number.

1220011202021 is a deficient number, since it is larger than the sum of its proper divisors (30482137645).

1220011202021 is an frugal number, since it uses more digits than its factorization.

1220011202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725765223 (or 725765182 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1220011202021 its reverse (1202021100221), we get a palindrome (2422032302242).

The spelling of 1220011202021 in words is "one trillion, two hundred twenty billion, eleven million, two hundred two thousand, twenty-one".