21769473 has 12 divisors (see below), whose sum is σ = 31905104. Its totient is φ = 13193400.

The previous prime is 21769453. The next prime is 21769487. The reversal of 21769473 is 37496712.

It is not a de Polignac number, because 21769473 - 2⁹ = 21768961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21769453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29623 + ... + 30348.

Almost surely, 2^21769473 is an apocalyptic number.

It is an amenable number.

21769473 is a deficient number, since it is larger than the sum of its proper divisors (10135631).

21769473 is a wasteful number, since it uses less digits than its factorization.

21769473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59996 (or 59985 counting only the distinct ones).

The product of its digits is 63504, while the sum is 39.

The square root of 21769473 is about 4665.7767842022. The cubic root of 21769473 is about 279.2217889321.

The spelling of 21769473 in words is "twenty-one million, seven hundred sixty-nine thousand, four hundred seventy-three".