21001200122210 has 32 divisors (see below), whose sum is σ = 47129965990272. Its totient is φ = 6545828609280.

The previous prime is 21001200122171. The next prime is 21001200122257. The reversal of 21001200122210 is 1222100210012.

It is a super-2 number, since 2×21001200122210² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13637142167 + ... + 13637143706.

It is an arithmetic number, because the mean of its divisors is an integer number (1472811437196).

Almost surely, 2^{21001200122210} is an apocalyptic number.

21001200122210 is an abundant number, since it is smaller than the sum of its proper divisors (26128765868062).

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

21001200122210 is a wasteful number, since it uses less digits than its factorization.

21001200122210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27274285898.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001200122210 its reverse (1222100210012), we get a palindrome (22223300332222).

The spelling of 21001200122210 in words is "twenty-one trillion, one billion, two hundred million, one hundred twenty-two thousand, two hundred ten".