21313029 has 8 divisors (see below), whose sum is σ = 28442880. Its totient is φ = 14195936.

The previous prime is 21313021. The next prime is 21313037. The reversal of 21313029 is 92031312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21313021) and next prime (21313037).

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 21313029 - 2³ = 21313021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21312996 and 21313014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313021) 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, 1849 + ... + 6785.

It is an arithmetic number, because the mean of its divisors is an integer number (3555360).

Almost surely, 2^21313029 is an apocalyptic number.

It is an amenable number.

21313029 is a deficient number, since it is larger than the sum of its proper divisors (7129851).

21313029 is a wasteful number, since it uses less digits than its factorization.

21313029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6379.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 21313029 is about 4616.6036217115. The cubic root of 21313029 is about 277.2564928203.

The spelling of 21313029 in words is "twenty-one million, three hundred thirteen thousand, twenty-nine".