21067629 has 16 divisors (see below), whose sum is σ = 30930240. Its totient is φ = 12648960.

The previous prime is 21067621. The next prime is 21067639. The reversal of 21067629 is 92676012.

It is not a de Polignac number, because 21067629 - 2³ = 21067621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21067629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21067621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 669 + ... + 6525.

It is an arithmetic number, because the mean of its divisors is an integer number (1933140).

Almost surely, 2^21067629 is an apocalyptic number.

It is an amenable number.

21067629 is a deficient number, since it is larger than the sum of its proper divisors (9862611).

21067629 is a wasteful number, since it uses less digits than its factorization.

21067629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5980.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 21067629 is about 4589.9486925237. The cubic root of 21067629 is about 276.1882642222.

The spelling of 21067629 in words is "twenty-one million, sixty-seven thousand, six hundred twenty-nine".