21429950 has 24 divisors (see below), whose sum is σ = 40460952. Its totient is φ = 8442720.

The previous prime is 21429937. The next prime is 21430007. The reversal of 21429950 is 5992412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152 + ... + 6548.

It is an arithmetic number, because the mean of its divisors is an integer number (1685873).

Almost surely, 2^21429950 is an apocalyptic number.

21429950 is a deficient number, since it is larger than the sum of its proper divisors (19031002).

21429950 is a wasteful number, since it uses less digits than its factorization.

21429950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6476 (or 6471 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 21429950 is about 4629.2493992007. The cubic root of 21429950 is about 277.7625683524.

The spelling of 21429950 in words is "twenty-one million, four hundred twenty-nine thousand, nine hundred fifty".