19911010200212 has 24 divisors (see below), whose sum is σ = 36049651869000. Its totient is φ = 9611183143296.

The previous prime is 19911010200199. The next prime is 19911010200233. The reversal of 19911010200212 is 21200201011991.

It can be written as a sum of positive squares in 4 ways, for example, as 9608425264516 + 10302584935696 = 3099746^2 + 3209764^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

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, 8095463 + ... + 10264430.

It is an arithmetic number, because the mean of its divisors is an integer number (1502068827875).

Almost surely, 2^{19911010200212} is an apocalyptic number.

It is an amenable number.

19911010200212 is a deficient number, since it is larger than the sum of its proper divisors (16138641668788).

19911010200212 is a wasteful number, since it uses less digits than its factorization.

19911010200212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18369275 (or 18369273 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 19911010200212 in words is "nineteen trillion, nine hundred eleven billion, ten million, two hundred thousand, two hundred twelve".