21010129 has 8 divisors (see below), whose sum is σ = 24316160. Its totient is φ = 17780256.

The previous prime is 21010127. The next prime is 21010153. The reversal of 21010129 is 92101012.

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 21010129 - 2¹ = 21010127 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010127) 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, 18444 + ... + 19549.

It is an arithmetic number, because the mean of its divisors is an integer number (3039520).

Almost surely, 2^21010129 is an apocalyptic number.

It is an amenable number.

21010129 is a deficient number, since it is larger than the sum of its proper divisors (3306031).

21010129 is an equidigital number, since it uses as much as digits as its factorization.

21010129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38079.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 21010129 is about 4583.6807262286. The cubic root of 21010129 is about 275.9367678782.

The spelling of 21010129 in words is "twenty-one million, ten thousand, one hundred twenty-nine".