21020311320210 has 96 divisors (see below), whose sum is σ = 55121152320000. Its totient is φ = 5557586041728.

The previous prime is 21020311320181. The next prime is 21020311320221. The reversal of 21020311320210 is 1202311302012.

21020311320210 is a `hidden beast` number, since 2 + 1 + 0 + 20 + 311 + 320 + 2 + 10 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2792091 + ... + 7059489.

It is an arithmetic number, because the mean of its divisors is an integer number (574178670000).

Almost surely, 2^{21020311320210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020311320210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27560576160000).

21020311320210 is an abundant number, since it is smaller than the sum of its proper divisors (34100840999790).

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

21020311320210 is a wasteful number, since it uses less digits than its factorization.

21020311320210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4267880 (or 4267877 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21020311320210 its reverse (1202311302012), we get a palindrome (22222622622222).

The spelling of 21020311320210 in words is "twenty-one trillion, twenty billion, three hundred eleven million, three hundred twenty thousand, two hundred ten".