21349536 has 48 divisors (see below), whose sum is σ = 60357024. Its totient is φ = 6568704.

The previous prime is 21349519. The next prime is 21349541. The reversal of 21349536 is 63594312.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21349497 and 21349506.

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, 7306 + ... + 9801.

It is an arithmetic number, because the mean of its divisors is an integer number (1257438).

Almost surely, 2^21349536 is an apocalyptic number.

21349536 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21349536 is an abundant number, since it is smaller than the sum of its proper divisors (39007488).

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

21349536 is a wasteful number, since it uses less digits than its factorization.

21349536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17133 (or 17125 counting only the distinct ones).

The product of its digits is 19440, while the sum is 33.

The square root of 21349536 is about 4620.5558107223. Note that the first 3 decimals coincide. The cubic root of 21349536 is about 277.4147063569.

It can be divided in two parts, 213495 and 36, that added together give a triangular number (213531 = T₆₅₃).

The spelling of 21349536 in words is "twenty-one million, three hundred forty-nine thousand, five hundred thirty-six".