21476137 has 8 divisors (see below), whose sum is σ = 22649760. Its totient is φ = 20306880.

The previous prime is 21476131. The next prime is 21476159. The reversal of 21476137 is 73167412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21476137 - 2³ = 21476129 is a prime.

It is a super-2 number, since 2×21476137² = 922448920885538, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21476099 and 21476108.

It is not an unprimeable number, because it can be changed into a prime (21476131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16098 + ... + 17380.

It is an arithmetic number, because the mean of its divisors is an integer number (2831220).

Almost surely, 2^21476137 is an apocalyptic number.

It is an amenable number.

21476137 is a deficient number, since it is larger than the sum of its proper divisors (1173623).

21476137 is a wasteful number, since it uses less digits than its factorization.

21476137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183.

The product of its digits is 7056, while the sum is 31.

The square root of 21476137 is about 4634.2353198775. The cubic root of 21476137 is about 277.9619748554.

The spelling of 21476137 in words is "twenty-one million, four hundred seventy-six thousand, one hundred thirty-seven".