21768199140 has 48 divisors (see below), whose sum is σ = 60976157760. Its totient is φ = 5802453120.

The previous prime is 21768199099. The next prime is 21768199183. The reversal of 21768199140 is 4199186712.

It is a self number, because there is not a number n which added to its sum of digits gives 21768199140.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73770 + ... + 221310.

It is an arithmetic number, because the mean of its divisors is an integer number (1270336620).

Almost surely, 2^21768199140 is an apocalyptic number.

21768199140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is a pronic number, being equal to 147540×147541.

It is an amenable number.

21768199140 is an abundant number, since it is smaller than the sum of its proper divisors (39207958620).

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

21768199140 is a wasteful number, since it uses less digits than its factorization.

21768199140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150012 (or 150010 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The spelling of 21768199140 in words is "twenty-one billion, seven hundred sixty-eight million, one hundred ninety-nine thousand, one hundred forty".