21129350 has 48 divisors (see below), whose sum is σ = 43965936. Its totient is φ = 7488000.

The previous prime is 21129343. The next prime is 21129359. The reversal of 21129350 is 5392112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21129359) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22082 + ... + 23018.

It is an arithmetic number, because the mean of its divisors is an integer number (915957).

Almost surely, 2^21129350 is an apocalyptic number.

21129350 is an abundant number, since it is smaller than the sum of its proper divisors (22836586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21129350 is a wasteful number, since it uses less digits than its factorization.

21129350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001 (or 996 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 21129350 is about 4596.6672709693. The cubic root of 21129350 is about 276.4577138751.

The spelling of 21129350 in words is "twenty-one million, one hundred twenty-nine thousand, three hundred fifty".