21350138 has 8 divisors (see below), whose sum is σ = 32324832. Its totient is φ = 10575196.

The previous prime is 21350137. The next prime is 21350143. The reversal of 21350138 is 83105312.

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

It is not an unprimeable number, because it can be changed into a prime (21350137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49670 + ... + 50097.

It is an arithmetic number, because the mean of its divisors is an integer number (4040604).

Almost surely, 2^21350138 is an apocalyptic number.

21350138 is a deficient number, since it is larger than the sum of its proper divisors (10974694).

21350138 is a wasteful number, since it uses less digits than its factorization.

21350138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99876.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21350138 is about 4620.6209539411. The cubic root of 21350138 is about 277.4173137841.

The spelling of 21350138 in words is "twenty-one million, three hundred fifty thousand, one hundred thirty-eight".