21011222020210 has 32 divisors (see below), whose sum is σ = 38354543798400. Its totient is φ = 8285755941120.

The previous prime is 21011222020189. The next prime is 21011222020231. The reversal of 21011222020210 is 1202022211012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21011222020189) and next prime (21011222020231).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16025146 + ... + 17286634.

It is an arithmetic number, because the mean of its divisors is an integer number (1198579493700).

Almost surely, 2^{21011222020210} is an apocalyptic number.

21011222020210 is a deficient number, since it is larger than the sum of its proper divisors (17343321778190).

21011222020210 is a wasteful number, since it uses less digits than its factorization.

21011222020210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285026.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21011222020210 its reverse (1202022211012), we get a palindrome (22213244231222).

The spelling of 21011222020210 in words is "twenty-one trillion, eleven billion, two hundred twenty-two million, twenty thousand, two hundred ten".