1211002220001 has 16 divisors (see below), whose sum is σ = 1845919494144. Its totient is φ = 691782726864.

The previous prime is 1211002219997. The next prime is 1211002220081. The reversal of 1211002220001 is 1000222001121.

It is not a de Polignac number, because 1211002220001 - 2² = 1211002219997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211002220081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9037815 + ... + 9170828.

It is an arithmetic number, because the mean of its divisors is an integer number (115369968384).

Almost surely, 2^{1211002220001} is an apocalyptic number.

It is an amenable number.

1211002220001 is a deficient number, since it is larger than the sum of its proper divisors (634917274143).

1211002220001 is a wasteful number, since it uses less digits than its factorization.

1211002220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18211820.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1211002220001 its reverse (1000222001121), we get a palindrome (2211224221122).

The spelling of 1211002220001 in words is "one trillion, two hundred eleven billion, two million, two hundred twenty thousand, one".