1221012002 has 8 divisors (see below), whose sum is σ = 2093163456. Its totient is φ = 523290852.

The previous prime is 1221011999. The next prime is 1221012007. The reversal of 1221012002 is 2002101221.

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 (1221012007) 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, 43607558 + ... + 43607585.

It is an arithmetic number, because the mean of its divisors is an integer number (261645432).

Almost surely, 2^1221012002 is an apocalyptic number.

1221012002 is a deficient number, since it is larger than the sum of its proper divisors (872151454).

1221012002 is an equidigital number, since it uses as much as digits as its factorization.

1221012002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87215152.

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

The square root of 1221012002 is about 34942.9821566506. The cubic root of 1221012002 is about 1068.8251004668.

Adding to 1221012002 its reverse (2002101221), we get a palindrome (3223113223).

The spelling of 1221012002 in words is "one billion, two hundred twenty-one million, twelve thousand, two".