21211021010220 has 24 divisors (see below), whose sum is σ = 59390858828784. Its totient is φ = 5656272269376.

The previous prime is 21211021010213. The next prime is 21211021010227. The reversal of 21211021010220 is 2201012011212.

It is an interprime number because it is at equal distance from previous prime (21211021010213) and next prime (21211021010227).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21211021010220.

It is not an unprimeable number, because it can be changed into a prime (21211021010227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176758508359 + ... + 176758508478.

It is an arithmetic number, because the mean of its divisors is an integer number (2474619117866).

Almost surely, 2^{21211021010220} is an apocalyptic number.

21211021010220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211021010220 is an abundant number, since it is smaller than the sum of its proper divisors (38179837818564).

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

21211021010220 is a wasteful number, since it uses less digits than its factorization.

21211021010220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353517016849 (or 353517016847 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21211021010220 its reverse (2201012011212), we get a palindrome (23412033021432).

The spelling of 21211021010220 in words is "twenty-one trillion, two hundred eleven billion, twenty-one million, ten thousand, two hundred twenty".