21209196192 has 96 divisors (see below), whose sum is σ = 59258594304. Its totient is φ = 6618931200.

The previous prime is 21209196121. The next prime is 21209196193. The reversal of 21209196192 is 29169190212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×21209196192² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21209196193) 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, 277692 + ... + 345732.

It is an arithmetic number, because the mean of its divisors is an integer number (617277024).

Almost surely, 2^21209196192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21209196192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29629297152).

21209196192 is an abundant number, since it is smaller than the sum of its proper divisors (38049398112).

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

21209196192 is a wasteful number, since it uses less digits than its factorization.

21209196192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68262 (or 68254 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 42.

The spelling of 21209196192 in words is "twenty-one billion, two hundred nine million, one hundred ninety-six thousand, one hundred ninety-two".