16821377340 has 48 divisors (see below), whose sum is σ = 48372832032. Its totient is φ = 4364464896.

The previous prime is 16821377299. The next prime is 16821377341. The reversal of 16821377340 is 4377312861.

It is a super-2 number, since 2×16821377340² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16821377292 and 16821377301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16821377341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3786379 + ... + 3790818.

It is an arithmetic number, because the mean of its divisors is an integer number (1007767334).

Almost surely, 2^16821377340 is an apocalyptic number.

16821377340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16821377340 is an abundant number, since it is smaller than the sum of its proper divisors (31551454692).

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

16821377340 is a wasteful number, since it uses less digits than its factorization.

16821377340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7577246 (or 7577244 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The spelling of 16821377340 in words is "sixteen billion, eight hundred twenty-one million, three hundred seventy-seven thousand, three hundred forty".