21120001021210 has 64 divisors (see below), whose sum is σ = 47125536595200. Its totient is φ = 6636044869632.

The previous prime is 21120001021183. The next prime is 21120001021243. The reversal of 21120001021210 is 1212010002112.

It is a super-2 number, since 2×21120001021210² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

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 31 ways as a sum of consecutive naturals, for example, 83358375 + ... + 83611354.

It is an arithmetic number, because the mean of its divisors is an integer number (736336509300).

Almost surely, 2^{21120001021210} is an apocalyptic number.

21120001021210 is an abundant number, since it is smaller than the sum of its proper divisors (26005535573990).

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

21120001021210 is a wasteful number, since it uses less digits than its factorization.

21120001021210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166969895.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21120001021210 its reverse (1212010002112), we get a palindrome (22332011023322).

The spelling of 21120001021210 in words is "twenty-one trillion, one hundred twenty billion, one million, twenty-one thousand, two hundred ten".