21210379710 has 64 divisors (see below), whose sum is σ = 54917593920. Its totient is φ = 5211786240.

The previous prime is 21210379691. The next prime is 21210379717. The reversal of 21210379710 is 1797301212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210379717) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174120 + ... + 269700.

It is an arithmetic number, because the mean of its divisors is an integer number (858087405).

Almost surely, 2^21210379710 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210379710, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27458796960).

21210379710 is an abundant number, since it is smaller than the sum of its proper divisors (33707214210).

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

21210379710 is a wasteful number, since it uses less digits than its factorization.

21210379710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96173.

The product of its (nonzero) digits is 5292, while the sum is 33.

The spelling of 21210379710 in words is "twenty-one billion, two hundred ten million, three hundred seventy-nine thousand, seven hundred ten".