21212000110191 has 16 divisors (see below), whose sum is σ = 30858920967168. Its totient is φ = 12853631548800.

The previous prime is 21212000110187. The next prime is 21212000110199. The reversal of 21212000110191 is 19101100021212.

It is not a de Polignac number, because 21212000110191 - 2² = 21212000110187 is a prime.

It is a super-2 number, since 2×21212000110191² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212000110199) 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, 52949770 + ... + 53348871.

It is an arithmetic number, because the mean of its divisors is an integer number (1928682560448).

Almost surely, 2^{21212000110191} is an apocalyptic number.

21212000110191 is a deficient number, since it is larger than the sum of its proper divisors (9646920856977).

21212000110191 is a wasteful number, since it uses less digits than its factorization.

21212000110191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106304702.

The product of its (nonzero) digits is 72, while the sum is 21.

The spelling of 21212000110191 in words is "twenty-one trillion, two hundred twelve billion, one hundred ten thousand, one hundred ninety-one".