1221121002 has 32 divisors (see below), whose sum is σ = 2465390592. Its totient is φ = 403192944.

The previous prime is 1221121001. The next prime is 1221121003. The reversal of 1221121002 is 2001211221.

It is an interprime number because it is at equal distance from previous prime (1221121001) and next prime (1221121003).

It is a super-2 number, since 2×1221121002² = 2982273003050968008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221121001) 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, 855013 + ... + 856439.

It is an arithmetic number, because the mean of its divisors is an integer number (77043456).

Almost surely, 2^1221121002 is an apocalyptic number.

1221121002 is an abundant number, since it is smaller than the sum of its proper divisors (1244269590).

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

1221121002 is a wasteful number, since it uses less digits than its factorization.

1221121002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1221121002 is about 34944.5418055524. The cubic root of 1221121002 is about 1068.8569042682.

Adding to 1221121002 its reverse (2001211221), we get a palindrome (3222332223).

The spelling of 1221121002 in words is "one billion, two hundred twenty-one million, one hundred twenty-one thousand, two".