21193980612 has 96 divisors (see below), whose sum is σ = 57354780672. Its totient is φ = 5966094336.

The previous prime is 21193980607. The next prime is 21193980617. The reversal of 21193980612 is 21608939112.

It is an interprime number because it is at equal distance from previous prime (21193980607) and next prime (21193980617).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (21193980617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2666308 + ... + 2674244.

It is an arithmetic number, because the mean of its divisors is an integer number (597445632).

Almost surely, 2^21193980612 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 21193980612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28677390336).

21193980612 is an abundant number, since it is smaller than the sum of its proper divisors (36160800060).

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

21193980612 is a wasteful number, since it uses less digits than its factorization.

21193980612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8417 (or 8415 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The spelling of 21193980612 in words is "twenty-one billion, one hundred ninety-three million, nine hundred eighty thousand, six hundred twelve".