1221021002 has 8 divisors (see below), whose sum is σ = 1835454816. Its totient is φ = 609202732.

The previous prime is 1221020981. The next prime is 1221021007. The reversal of 1221021002 is 2001201221.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (1221021007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 652718 + ... + 654585.

It is an arithmetic number, because the mean of its divisors is an integer number (229431852).

Almost surely, 2^1221021002 is an apocalyptic number.

1221021002 is a deficient number, since it is larger than the sum of its proper divisors (614433814).

1221021002 is a wasteful number, since it uses less digits than its factorization.

1221021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307772.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1221021002 is about 34943.1109376369. The cubic root of 1221021002 is about 1068.8277265405.

Adding to 1221021002 its reverse (2001201221), we get a palindrome (3222222223).

The spelling of 1221021002 in words is "one billion, two hundred twenty-one million, twenty-one thousand, two".