1221013010220 has 48 divisors (see below), whose sum is σ = 3418906917888. Its totient is φ = 325596756160.

The previous prime is 1221013010219. The next prime is 1221013010227. The reversal of 1221013010220 is 220103101221.

It is a super-2 number, since 2×1221013010220² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1221013010220.

It is not an unprimeable number, because it can be changed into a prime (1221013010227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3176215 + ... + 3539825.

It is an arithmetic number, because the mean of its divisors is an integer number (71227227456).

Almost surely, 2^{1221013010220} is an apocalyptic number.

1221013010220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221013010220 is an abundant number, since it is smaller than the sum of its proper divisors (2197893907668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221013010220 is a wasteful number, since it uses less digits than its factorization.

1221013010220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419590 (or 419588 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1221013010220 its reverse (220103101221), we get a palindrome (1441116111441).

The spelling of 1221013010220 in words is "one trillion, two hundred twenty-one billion, thirteen million, ten thousand, two hundred twenty".