21477033 has 12 divisors (see below), whose sum is σ = 31308420. Its totient is φ = 14186016.

The previous prime is 21477007. The next prime is 21477037. The reversal of 21477033 is 33077412.

It can be written as a sum of positive squares in 2 ways, for example, as 15586704 + 5890329 = 3948^2 + 2427^2 .

It is not a de Polignac number, because 21477033 - 2⁶ = 21476969 is a prime.

It is a super-2 number, since 2×21477033² = 922525892966178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21476988 and 21477006.

It is not an unprimeable number, because it can be changed into a prime (21477037) 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, 9966 + ... + 11927.

It is an arithmetic number, because the mean of its divisors is an integer number (2609035).

Almost surely, 2^21477033 is an apocalyptic number.

It is an amenable number.

21477033 is a deficient number, since it is larger than the sum of its proper divisors (9831387).

21477033 is a wasteful number, since it uses less digits than its factorization.

21477033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22008 (or 22005 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 21477033 is about 4634.3319906973. The cubic root of 21477033 is about 277.9658403933.

It can be divided in two parts, 2147 and 7033, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 21477033 in words is "twenty-one million, four hundred seventy-seven thousand, thirty-three".