21350007 has 32 divisors (see below), whose sum is σ = 36610560. Its totient is φ = 12044160.

The previous prime is 21349997. The next prime is 21350009. The reversal of 21350007 is 70005312.

It is not a de Polignac number, because 21350007 - 2¹¹ = 21347959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21350009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15007 + ... + 16367.

It is an arithmetic number, because the mean of its divisors is an integer number (1144080).

Almost surely, 2^21350007 is an apocalyptic number.

21350007 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21350007 is a deficient number, since it is larger than the sum of its proper divisors (15260553).

21350007 is a wasteful number, since it uses less digits than its factorization.

21350007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460 (or 1454 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 21350007 is about 4620.6067783355. The cubic root of 21350007 is about 277.4167463913.

Adding to 21350007 its reverse (70005312), we get a palindrome (91355319).

The spelling of 21350007 in words is "twenty-one million, three hundred fifty thousand, seven".