21361029 has 8 divisors (see below), whose sum is σ = 28514592. Its totient is φ = 14224080.

The previous prime is 21361013. The next prime is 21361031. The reversal of 21361029 is 92016312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21361029 - 2⁴ = 21361013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361079) 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, 754 + ... + 6579.

It is an arithmetic number, because the mean of its divisors is an integer number (3564324).

Almost surely, 2^21361029 is an apocalyptic number.

It is an amenable number.

21361029 is a deficient number, since it is larger than the sum of its proper divisors (7153563).

21361029 is an equidigital number, since it uses as much as digits as its factorization.

21361029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8307.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 21361029 is about 4621.7993249383. The cubic root of 21361029 is about 277.4644772320.

The spelling of 21361029 in words is "twenty-one million, three hundred sixty-one thousand, twenty-nine".