1221100211002 has 64 divisors (see below), whose sum is σ = 2216541634560. Its totient is φ = 492851822400.

The previous prime is 1221100210951. The next prime is 1221100211033. The reversal of 1221100211002 is 2001120011221.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82349113 + ... + 82363939.

It is an arithmetic number, because the mean of its divisors is an integer number (34633463040).

Almost surely, 2^{1221100211002} is an apocalyptic number.

1221100211002 is a deficient number, since it is larger than the sum of its proper divisors (995441423558).

1221100211002 is a wasteful number, since it uses less digits than its factorization.

1221100211002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16667.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221100211002 its reverse (2001120011221), we get a palindrome (3222220222223).

The spelling of 1221100211002 in words is "one trillion, two hundred twenty-one billion, one hundred million, two hundred eleven thousand, two".