21501622 has 4 divisors (see below), whose sum is σ = 32252436. Its totient is φ = 10750810.

The previous prime is 21501593. The next prime is 21501643. The reversal of 21501622 is 22610512.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21501622.

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, 5375404 + ... + 5375407.

It is an arithmetic number, because the mean of its divisors is an integer number (8063109).

Almost surely, 2^21501622 is an apocalyptic number.

21501622 is a deficient number, since it is larger than the sum of its proper divisors (10750814).

21501622 is a wasteful number, since it uses less digits than its factorization.

21501622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10750813.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21501622 is about 4636.9841492073. The cubic root of 21501622 is about 278.0718807277.

The spelling of 21501622 in words is "twenty-one million, five hundred one thousand, six hundred twenty-two".