1220000012021 has 28 divisors (see below), whose sum is σ = 1434214863840. Its totient is φ = 1037718634680.

The previous prime is 1220000011991. The next prime is 1220000012027. The reversal of 1220000012021 is 1202100000221.

It is a happy number.

It is not a de Polignac number, because 1220000012021 - 2⁶ = 1220000011957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220000011993 and 1220000012011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220000012027) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 15372440 + ... + 15451598.

Almost surely, 2^{1220000012021} is an apocalyptic number.

It is an amenable number.

1220000012021 is a deficient number, since it is larger than the sum of its proper divisors (214214851819).

1220000012021 is an frugal number, since it uses more digits than its factorization.

1220000012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79332 (or 79297 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1220000012021 its reverse (1202100000221), we get a palindrome (2422100012242).

The spelling of 1220000012021 in words is "one trillion, two hundred twenty billion, twelve thousand, twenty-one".