21211010219972 has 24 divisors (see below), whose sum is σ = 37448132975736. Its totient is φ = 10511545540608.

The previous prime is 21211010219969. The next prime is 21211010220011. The reversal of 21211010219972 is 27991201011212.

It can be written as a sum of positive squares in 4 ways, for example, as 3462450106756 + 17748560113216 = 1860766^2 + 4212904^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64468748 + ... + 64796924.

It is an arithmetic number, because the mean of its divisors is an integer number (1560338873989).

Almost surely, 2^{21211010219972} is an apocalyptic number.

It is an amenable number.

21211010219972 is a deficient number, since it is larger than the sum of its proper divisors (16237122755764).

21211010219972 is a wasteful number, since it uses less digits than its factorization.

21211010219972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471287 (or 471285 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 38.

The spelling of 21211010219972 in words is "twenty-one trillion, two hundred eleven billion, ten million, two hundred nineteen thousand, nine hundred seventy-two".