21620751006 has 8 divisors (see below), whose sum is σ = 43241502024. Its totient is φ = 7206917000.

The previous prime is 21620750981. The next prime is 21620751007. The reversal of 21620751006 is 60015702612.

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

21620751006 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620751007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1801729245 + ... + 1801729256.

It is an arithmetic number, because the mean of its divisors is an integer number (5405187753).

Almost surely, 2^21620751006 is an apocalyptic number.

21620751006 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21620751006 is a wasteful number, since it uses less digits than its factorization.

21620751006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3603458506.

The product of its (nonzero) digits is 5040, while the sum is 30.

The spelling of 21620751006 in words is "twenty-one billion, six hundred twenty million, seven hundred fifty-one thousand, six".