21651082 has 8 divisors (see below), whose sum is σ = 33524352. Its totient is φ = 10476300.

The previous prime is 21651043. The next prime is 21651101. The reversal of 21651082 is 28015612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174544 + ... + 174667.

It is an arithmetic number, because the mean of its divisors is an integer number (4190544).

Almost surely, 2^21651082 is an apocalyptic number.

21651082 is a deficient number, since it is larger than the sum of its proper divisors (11873270).

21651082 is a wasteful number, since it uses less digits than its factorization.

21651082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349244.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 21651082 is about 4653.0723183720. The cubic root of 21651082 is about 278.7146957373.

Adding to 21651082 its reverse (28015612), we get a palindrome (49666694).

It can be divided in two parts, 2165 and 1082, that multiplied together give a triangular number (2342530 = T₂₁₆₄).

The spelling of 21651082 in words is "twenty-one million, six hundred fifty-one thousand, eighty-two".