21378548380 has 48 divisors (see below), whose sum is σ = 51453984960. Its totient is φ = 7309006848.

The previous prime is 21378548363. The next prime is 21378548381. The reversal of 21378548380 is 8384587312.

It is a super-3 number, since 3×21378548380³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21378548381) 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, 166875 + ... + 265714.

It is an arithmetic number, because the mean of its divisors is an integer number (1071958020).

Almost surely, 2^21378548380 is an apocalyptic number.

21378548380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21378548380 is an abundant number, since it is smaller than the sum of its proper divisors (30075436580).

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

21378548380 is a wasteful number, since it uses less digits than its factorization.

21378548380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432958 (or 432956 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 21378548380 in words is "twenty-one billion, three hundred seventy-eight million, five hundred forty-eight thousand, three hundred eighty".