21149736 has 32 divisors (see below), whose sum is σ = 55658400. Its totient is φ = 6678720.

The previous prime is 21149731. The next prime is 21149741. The reversal of 21149736 is 63794112.

It is an interprime number because it is at equal distance from previous prime (21149731) and next prime (21149741).

It is a super-2 number, since 2×21149736² = 894622665739392, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21149697 and 21149706.

It is not an unprimeable number, because it can be changed into a prime (21149731) 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, 22735 + ... + 23646.

It is an arithmetic number, because the mean of its divisors is an integer number (1739325).

Almost surely, 2^21149736 is an apocalyptic number.

It is an amenable number.

21149736 is an abundant number, since it is smaller than the sum of its proper divisors (34508664).

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

21149736 is a wasteful number, since it uses less digits than its factorization.

21149736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46409 (or 46405 counting only the distinct ones).

The product of its digits is 9072, while the sum is 33.

The square root of 21149736 is about 4598.8842125020. The cubic root of 21149736 is about 276.5465958552.

The spelling of 21149736 in words is "twenty-one million, one hundred forty-nine thousand, seven hundred thirty-six".