21221927547 has 16 divisors (see below), whose sum is σ = 28586976000. Its totient is φ = 14002701984.

The previous prime is 21221927539. The next prime is 21221927561. The reversal of 21221927547 is 74572912212.

It is not a de Polignac number, because 21221927547 - 2³ = 21221927539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221927499 and 21221927508.

It is not an unprimeable number, because it can be changed into a prime (21221927537) 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, 265204 + ... + 335822.

It is an arithmetic number, because the mean of its divisors is an integer number (1786686000).

Almost surely, 2^21221927547 is an apocalyptic number.

21221927547 is a deficient number, since it is larger than the sum of its proper divisors (7365048453).

21221927547 is a wasteful number, since it uses less digits than its factorization.

21221927547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71650.

The product of its digits is 141120, while the sum is 42.

The spelling of 21221927547 in words is "twenty-one billion, two hundred twenty-one million, nine hundred twenty-seven thousand, five hundred forty-seven".