21930029 has 8 divisors (see below), whose sum is σ = 24161760. Its totient is φ = 19738000.

The previous prime is 21929993. The next prime is 21930101. The reversal of 21930029 is 92003912.

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 21930029 - 2²⁴ = 5152813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21930329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8759 + ... + 10980.

It is an arithmetic number, because the mean of its divisors is an integer number (3020220).

Almost surely, 2^21930029 is an apocalyptic number.

It is an amenable number.

21930029 is a deficient number, since it is larger than the sum of its proper divisors (2231731).

21930029 is a wasteful number, since it uses less digits than its factorization.

21930029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19851.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 21930029 is about 4682.9508859265. The cubic root of 21930029 is about 279.9065547020.

The spelling of 21930029 in words is "twenty-one million, nine hundred thirty thousand, twenty-nine".