21122007 has 8 divisors (see below), whose sum is σ = 29819376. Its totient is φ = 13252992.

The previous prime is 21121999. The next prime is 21122009. The reversal of 21122007 is 70022112.

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

It is not a de Polignac number, because 21122007 - 2³ = 21121999 is a prime.

It is a super-2 number, since 2×21122007² = 892278359416098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207028 + ... + 207129.

It is an arithmetic number, because the mean of its divisors is an integer number (3727422).

Almost surely, 2^21122007 is an apocalyptic number.

21122007 is a deficient number, since it is larger than the sum of its proper divisors (8697369).

21122007 is a wasteful number, since it uses less digits than its factorization.

21122007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414177.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 21122007 is about 4595.8684707028. The cubic root of 21122007 is about 276.4256847435.

Adding to 21122007 its reverse (70022112), we get a palindrome (91144119).

The spelling of 21122007 in words is "twenty-one million, one hundred twenty-two thousand, seven".