21012220120001 has 16 divisors (see below), whose sum is σ = 22932840572928. Its totient is φ = 19093337960400.

The previous prime is 21012220119941. The next prime is 21012220120057. The reversal of 21012220120001 is 10002102221012.

It is not a de Polignac number, because 21012220120001 - 2¹⁸ = 21012219857857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012220120081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254445620 + ... + 254528186.

It is an arithmetic number, because the mean of its divisors is an integer number (1433302535808).

Almost surely, 2^{21012220120001} is an apocalyptic number.

It is an amenable number.

21012220120001 is a deficient number, since it is larger than the sum of its proper divisors (1920620452927).

21012220120001 is a wasteful number, since it uses less digits than its factorization.

21012220120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92812.

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

Adding to 21012220120001 its reverse (10002102221012), we get a palindrome (31014322341013).

The spelling of 21012220120001 in words is "twenty-one trillion, twelve billion, two hundred twenty million, one hundred twenty thousand, one".