21357029 has 8 divisors (see below), whose sum is σ = 22006560. Its totient is φ = 20711376.

The previous prime is 21356989. The next prime is 21357031. The reversal of 21357029 is 92075312.

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 21357029 - 2⁸ = 21356773 is a prime.

It is a super-2 number, since 2×21357029² = 912245375413682, 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 = 21356992 and 21357010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21357059) 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 7 ways as a sum of consecutive naturals, for example, 13262 + ... + 14784.

It is an arithmetic number, because the mean of its divisors is an integer number (2750820).

Almost surely, 2^21357029 is an apocalyptic number.

It is an amenable number.

21357029 is a deficient number, since it is larger than the sum of its proper divisors (649531).

21357029 is a wasteful number, since it uses less digits than its factorization.

21357029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 21357029 is about 4621.3665727791. The cubic root of 21357029 is about 277.4471571052.

The spelling of 21357029 in words is "twenty-one million, three hundred fifty-seven thousand, twenty-nine".