129863021 has 8 divisors (see below), whose sum is σ = 133478400. Its totient is φ = 126283248.

The previous prime is 129863003. The next prime is 129863033. The reversal of 129863021 is 120368921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129863021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129833021) 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, 1421 + ... + 16178.

It is an arithmetic number, because the mean of its divisors is an integer number (16684800).

Almost surely, 2^129863021 is an apocalyptic number.

It is an amenable number.

129863021 is a deficient number, since it is larger than the sum of its proper divisors (3615379).

129863021 is a wasteful number, since it uses less digits than its factorization.

129863021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17803.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 129863021 is about 11395.7457412843. The cubic root of 129863021 is about 506.4017143017.

The spelling of 129863021 in words is "one hundred twenty-nine million, eight hundred sixty-three thousand, twenty-one".