21020212096 has 64 divisors (see below), whose sum is σ = 45125599680. Its totient is φ = 9695582208.

The previous prime is 21020212093. The next prime is 21020212099. The reversal of 21020212096 is 69021202012.

It is an interprime number because it is at equal distance from previous prime (21020212093) and next prime (21020212099).

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 21020212096.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020212093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3719545 + ... + 3725191.

It is an arithmetic number, because the mean of its divisors is an integer number (705087495).

Almost surely, 2^21020212096 is an apocalyptic number.

21020212096 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020212096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22562799840).

21020212096 is an abundant number, since it is smaller than the sum of its proper divisors (24105387584).

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

21020212096 is a wasteful number, since it uses less digits than its factorization.

21020212096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7911 (or 7899 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 21020212096 in words is "twenty-one billion, twenty million, two hundred twelve thousand, ninety-six".