21340654 has 16 divisors (see below), whose sum is σ = 32739840. Its totient is φ = 10429560.

The previous prime is 21340651. The next prime is 21340663. The reversal of 21340654 is 45604312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340651) 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, 25909 + ... + 26719.

It is an arithmetic number, because the mean of its divisors is an integer number (2046240).

Almost surely, 2^21340654 is an apocalyptic number.

21340654 is a deficient number, since it is larger than the sum of its proper divisors (11399186).

21340654 is a wasteful number, since it uses less digits than its factorization.

21340654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 21340654 is about 4619.5945709553. The cubic root of 21340654 is about 277.3762302795.

Adding to 21340654 its reverse (45604312), we get a palindrome (66944966).

The spelling of 21340654 in words is "twenty-one million, three hundred forty thousand, six hundred fifty-four".