21111212010196 has 48 divisors (see below), whose sum is σ = 48063470837760. Its totient is φ = 7867532423520.

The previous prime is 21111212010193. The next prime is 21111212010223. The reversal of 21111212010196 is 69101021211112.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111212010193) 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, 1490055876 + ... + 1490070043.

It is an arithmetic number, because the mean of its divisors is an integer number (1001322309120).

Almost surely, 2^{21111212010196} is an apocalyptic number.

It is an amenable number.

21111212010196 is an abundant number, since it is smaller than the sum of its proper divisors (26952258827564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111212010196 is a wasteful number, since it uses less digits than its factorization.

21111212010196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2980125964 (or 2980125962 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 28.

The spelling of 21111212010196 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, ten thousand, one hundred ninety-six".