21210111121002 has 16 divisors (see below), whose sum is σ = 42452928674112. Its totient is φ = 7064585968320.

The previous prime is 21210111120977. The next prime is 21210111121007. The reversal of 21210111121002 is 20012111101212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21210111121007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1362759574 + ... + 1362775137.

It is an arithmetic number, because the mean of its divisors is an integer number (2653308042132).

Almost surely, 2^{21210111121002} is an apocalyptic number.

21210111121002 is an abundant number, since it is smaller than the sum of its proper divisors (21242817553110).

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

21210111121002 is a wasteful number, since it uses less digits than its factorization.

21210111121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725536013.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21210111121002 its reverse (20012111101212), we get a palindrome (41222222222214).

The spelling of 21210111121002 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, one hundred twenty-one thousand, two".