21967029 has 24 divisors (see below), whose sum is σ = 36708672. Its totient is φ = 12398400.

The previous prime is 21967019. The next prime is 21967031. The reversal of 21967029 is 92076912.

It is not a de Polignac number, because 21967029 - 2⁸ = 21966773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21966984 and 21967002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21967019) 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 23 ways as a sum of consecutive naturals, for example, 3129 + ... + 7329.

It is an arithmetic number, because the mean of its divisors is an integer number (1529528).

Almost surely, 2^21967029 is an apocalyptic number.

It is an amenable number.

21967029 is a deficient number, since it is larger than the sum of its proper divisors (14741643).

21967029 is a wasteful number, since it uses less digits than its factorization.

21967029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4297 (or 4294 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 21967029 is about 4686.8997215644. The cubic root of 21967029 is about 280.0638842327.

The spelling of 21967029 in words is "twenty-one million, nine hundred sixty-seven thousand, twenty-nine".