21275471938 has 16 divisors (see below), whose sum is σ = 36517340160. Its totient is φ = 9106783776.

The previous prime is 21275471897. The next prime is 21275471963. The reversal of 21275471938 is 83917457212.

It is a junction number, because it is equal to n+sod(n) for n = 21275471891 and 21275471900.

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, 927906 + ... + 950557.

It is an arithmetic number, because the mean of its divisors is an integer number (2282333760).

Almost surely, 2^21275471938 is an apocalyptic number.

21275471938 is a deficient number, since it is larger than the sum of its proper divisors (15241868222).

21275471938 is a wasteful number, since it uses less digits than its factorization.

21275471938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879281.

The product of its digits is 846720, while the sum is 49.

The spelling of 21275471938 in words is "twenty-one billion, two hundred seventy-five million, four hundred seventy-one thousand, nine hundred thirty-eight".