21011212302220 has 96 divisors (see below), whose sum is σ = 51501782384640. Its totient is φ = 7050302622720.

The previous prime is 21011212302209. The next prime is 21011212302233. The reversal of 21011212302220 is 2220321211012.

It is a super-2 number, since 2×21011212302220² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 252834436 + ... + 252917524.

It is an arithmetic number, because the mean of its divisors is an integer number (536476899840).

Almost surely, 2^{21011212302220} is an apocalyptic number.

21011212302220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011212302220 is an abundant number, since it is smaller than the sum of its proper divisors (30490570082420).

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

21011212302220 is a wasteful number, since it uses less digits than its factorization.

21011212302220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121583 (or 121581 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21011212302220 its reverse (2220321211012), we get a palindrome (23231533513232).

The spelling of 21011212302220 in words is "twenty-one trillion, eleven billion, two hundred twelve million, three hundred two thousand, two hundred twenty".