21007146 has 16 divisors (see below), whose sum is σ = 42073344. Its totient is φ = 6992544.

The previous prime is 21007139. The next prime is 21007153. The reversal of 21007146 is 64170012.

It is an interprime number because it is at equal distance from previous prime (21007139) and next prime (21007153).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3150 + ... + 7206.

It is an arithmetic number, because the mean of its divisors is an integer number (2629584).

Almost surely, 2^21007146 is an apocalyptic number.

21007146 is an abundant number, since it is smaller than the sum of its proper divisors (21066198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21007146 is a wasteful number, since it uses less digits than its factorization.

21007146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4925.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21007146 is about 4583.3553211594. The cubic root of 21007146 is about 275.9237081719.

Adding to 21007146 its reverse (64170012), we get a palindrome (85177158).

The spelling of 21007146 in words is "twenty-one million, seven thousand, one hundred forty-six".