21082654 has 4 divisors (see below), whose sum is σ = 31623984. Its totient is φ = 10541326.

The previous prime is 21082631. The next prime is 21082667. The reversal of 21082654 is 45628012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5270662 + ... + 5270665.

It is an arithmetic number, because the mean of its divisors is an integer number (7905996).

Almost surely, 2^21082654 is an apocalyptic number.

21082654 is a deficient number, since it is larger than the sum of its proper divisors (10541330).

21082654 is a wasteful number, since it uses less digits than its factorization.

21082654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10541329.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21082654 is about 4591.5851293426. The cubic root of 21082654 is about 276.2539058845.

It can be divided in two parts, 21082 and 654, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 21082654 in words is "twenty-one million, eighty-two thousand, six hundred fifty-four".