2101222021972 has 48 divisors (see below), whose sum is σ = 3745019678400. Its totient is φ = 1031329297152.

The previous prime is 2101222021903. The next prime is 2101222021973. The reversal of 2101222021972 is 2791202221012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101222021973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181243408 + ... + 181255000.

It is an arithmetic number, because the mean of its divisors is an integer number (78021243300).

Almost surely, 2^{2101222021972} is an apocalyptic number.

It is an amenable number.

2101222021972 is a deficient number, since it is larger than the sum of its proper divisors (1643797656428).

2101222021972 is a wasteful number, since it uses less digits than its factorization.

2101222021972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13960 (or 13958 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

Adding to 2101222021972 its reverse (2791202221012), we get a palindrome (4892424242984).

The spelling of 2101222021972 in words is "two trillion, one hundred one billion, two hundred twenty-two million, twenty-one thousand, nine hundred seventy-two".