21061642522 has 8 divisors (see below), whose sum is σ = 31607964000. Its totient is φ = 10525654524.

The previous prime is 21061642489. The next prime is 21061642531. The reversal of 21061642522 is 22524616012.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2578272 + ... + 2586427.

It is an arithmetic number, because the mean of its divisors is an integer number (3950995500).

Almost surely, 2^21061642522 is an apocalyptic number.

21061642522 is a deficient number, since it is larger than the sum of its proper divisors (10546321478).

21061642522 is a wasteful number, since it uses less digits than its factorization.

21061642522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5166740.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 21061642522 in words is "twenty-one billion, sixty-one million, six hundred forty-two thousand, five hundred twenty-two".