21900029 has 8 divisors (see below), whose sum is σ = 23728320. Its totient is φ = 20131776.

The previous prime is 21900019. The next prime is 21900031. The reversal of 21900029 is 92000912.

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 21900029 - 2⁴ = 21900013 is a prime.

It is a super-2 number, since 2×21900029² = 959222540401682, 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 = 21899977 and 21900013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21900019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14249 + ... + 15710.

It is an arithmetic number, because the mean of its divisors is an integer number (2966040).

Almost surely, 2^21900029 is an apocalyptic number.

It is an amenable number.

21900029 is a deficient number, since it is larger than the sum of its proper divisors (1828291).

21900029 is a wasteful number, since it uses less digits than its factorization.

21900029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30019.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 21900029 is about 4679.7466811784. The cubic root of 21900029 is about 279.7788602571.

The spelling of 21900029 in words is "twenty-one million, nine hundred thousand, twenty-nine".