21081022710 has 128 divisors (see below), whose sum is σ = 56383824384. Its totient is φ = 5001384960.

The previous prime is 21081022691. The next prime is 21081022741. The reversal of 21081022710 is 1722018012.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 3468234 + ... + 3474306.

It is an arithmetic number, because the mean of its divisors is an integer number (440498628).

Almost surely, 2^21081022710 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21081022710, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28191912192).

21081022710 is an abundant number, since it is smaller than the sum of its proper divisors (35302801674).

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

21081022710 is a wasteful number, since it uses less digits than its factorization.

21081022710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6318.

The product of its (nonzero) digits is 448, while the sum is 24.

The spelling of 21081022710 in words is "twenty-one billion, eighty-one million, twenty-two thousand, seven hundred ten".