1220221221002 has 48 divisors (see below), whose sum is σ = 2155187774880. Its totient is φ = 516561730272.

The previous prime is 1220221220993. The next prime is 1220221221007. The reversal of 1220221221002 is 2001221220221.

It is a happy number.

It is a super-2 number, since 2×1220221221002² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1220221221007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70163324 + ... + 70180712.

It is an arithmetic number, because the mean of its divisors is an integer number (44899745310).

Almost surely, 2^{1220221221002} is an apocalyptic number.

1220221221002 is a deficient number, since it is larger than the sum of its proper divisors (934966553878).

1220221221002 is a wasteful number, since it uses less digits than its factorization.

1220221221002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26115 (or 26108 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1220221221002 its reverse (2001221220221), we get a palindrome (3221442441223).

The spelling of 1220221221002 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred twenty-one thousand, two".