1220220100021 has 8 divisors (see below), whose sum is σ = 1371217236480. Its totient is φ = 1077384970992.

The previous prime is 1220220100019. The next prime is 1220220100079. The reversal of 1220220100021 is 1200010220221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1220220100021 - 2¹ = 1220220100019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 1220220099974 and 1220220100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220220100081) 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, 2040501541 + ... + 2040502138.

It is an arithmetic number, because the mean of its divisors is an integer number (171402154560).

Almost surely, 2^{1220220100021} is an apocalyptic number.

It is an amenable number.

1220220100021 is a deficient number, since it is larger than the sum of its proper divisors (150997136459).

1220220100021 is a wasteful number, since it uses less digits than its factorization.

1220220100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4081003715.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1220220100021 its reverse (1200010220221), we get a palindrome (2420230320242).

The spelling of 1220220100021 in words is "one trillion, two hundred twenty billion, two hundred twenty million, one hundred thousand, twenty-one".