21227106540 has 24 divisors (see below), whose sum is σ = 59435898480. Its totient is φ = 5660561728.

The previous prime is 21227106503. The next prime is 21227106557. The reversal of 21227106540 is 4560172212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21227106498 and 21227106507.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176892495 + ... + 176892614.

It is an arithmetic number, because the mean of its divisors is an integer number (2476495770).

Almost surely, 2^21227106540 is an apocalyptic number.

21227106540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21227106540 is an abundant number, since it is smaller than the sum of its proper divisors (38208791940).

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

21227106540 is a wasteful number, since it uses less digits than its factorization.

21227106540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353785121 (or 353785119 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

Adding to 21227106540 its reverse (4560172212), we get a palindrome (25787278752).

The spelling of 21227106540 in words is "twenty-one billion, two hundred twenty-seven million, one hundred six thousand, five hundred forty".