21649962 has 16 divisors (see below), whose sum is σ = 43787520. Its totient is φ = 7135392.

The previous prime is 21649961. The next prime is 21649963. The reversal of 21649962 is 26994612.

It is an interprime number because it is at equal distance from previous prime (21649961) and next prime (21649963).

It is a self number, because there is not a number n which added to its sum of digits gives 21649962.

It is not an unprimeable number, because it can be changed into a prime (21649961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19738 + ... + 20805.

It is an arithmetic number, because the mean of its divisors is an integer number (2736720).

Almost surely, 2^21649962 is an apocalyptic number.

21649962 is an abundant number, since it is smaller than the sum of its proper divisors (22137558).

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

21649962 is a wasteful number, since it uses less digits than its factorization.

21649962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40637.

The product of its digits is 46656, while the sum is 39.

The square root of 21649962 is about 4652.9519662253. The cubic root of 21649962 is about 278.7098897290.

The spelling of 21649962 in words is "twenty-one million, six hundred forty-nine thousand, nine hundred sixty-two".