1221021020002 has 8 divisors (see below), whose sum is σ = 2093178891456. Its totient is φ = 523294722852.

The previous prime is 1221021019997. The next prime is 1221021020017. The reversal of 1221021020002 is 2000201201221.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43607893558 + ... + 43607893585.

It is an arithmetic number, because the mean of its divisors is an integer number (261647361432).

Almost surely, 2^{1221021020002} is an apocalyptic number.

1221021020002 is a deficient number, since it is larger than the sum of its proper divisors (872157871454).

1221021020002 is an equidigital number, since it uses as much as digits as its factorization.

1221021020002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87215787152.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1221021020002 its reverse (2000201201221), we get a palindrome (3221222221223).

The spelling of 1221021020002 in words is "one trillion, two hundred twenty-one billion, twenty-one million, twenty thousand, two".