21133707 has 8 divisors (see below), whose sum is σ = 32203776. Its totient is φ = 12076392.

The previous prime is 21133687. The next prime is 21133727. The reversal of 21133707 is 70733112.

It is an interprime number because it is at equal distance from previous prime (21133687) and next prime (21133727).

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

It is not a de Polignac number, because 21133707 - 2⁷ = 21133579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21133727) 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, 503163 + ... + 503204.

It is an arithmetic number, because the mean of its divisors is an integer number (4025472).

Almost surely, 2^21133707 is an apocalyptic number.

21133707 is a deficient number, since it is larger than the sum of its proper divisors (11070069).

21133707 is a wasteful number, since it uses less digits than its factorization.

21133707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006377.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 21133707 is about 4597.1411768620. The cubic root of 21133707 is about 276.4767149877.

Adding to 21133707 its reverse (70733112), we get a palindrome (91866819).

The spelling of 21133707 in words is "twenty-one million, one hundred thirty-three thousand, seven hundred seven".