1221231002 has 16 divisors (see below), whose sum is σ = 1893146472. Its totient is φ = 590446080.

The previous prime is 1221231001. The next prime is 1221231013. The reversal of 1221231002 is 2001321221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 644702881 + 576528121 = 25391^2 + 24011^2 .

It is not an unprimeable number, because it can be changed into a prime (1221231001) 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, 56633 + ... + 75164.

Almost surely, 2^1221231002 is an apocalyptic number.

1221231002 is a deficient number, since it is larger than the sum of its proper divisors (671915470).

1221231002 is a wasteful number, since it uses less digits than its factorization.

1221231002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131953.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1221231002 is about 34946.1156925916. The cubic root of 1221231002 is about 1068.8889979288. Note that the first 3 decimals are identical.

Adding to 1221231002 its reverse (2001321221), we get a palindrome (3222552223).

The spelling of 1221231002 in words is "one billion, two hundred twenty-one million, two hundred thirty-one thousand, two".