21277548860 has 24 divisors (see below), whose sum is σ = 46625586336. Its totient is φ = 8140975040.

The previous prime is 21277548811. The next prime is 21277548869. The reversal of 21277548860 is 6884577212.

It is a junction number, because it is equal to n+sod(n) for n = 21277548799 and 21277548808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21277548869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23127311 + ... + 23128230.

It is an arithmetic number, because the mean of its divisors is an integer number (1942732764).

Almost surely, 2^21277548860 is an apocalyptic number.

21277548860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21277548860 is an abundant number, since it is smaller than the sum of its proper divisors (25348037476).

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

21277548860 is a wasteful number, since it uses less digits than its factorization.

21277548860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46255573 (or 46255571 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 50.

The spelling of 21277548860 in words is "twenty-one billion, two hundred seventy-seven million, five hundred forty-eight thousand, eight hundred sixty".