21201121002 has 16 divisors (see below), whose sum is σ = 43864388640. Its totient is φ = 6823349232.

The previous prime is 21201120991. The next prime is 21201121093. The reversal of 21201121002 is 20012110212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60922588 + ... + 60922935.

It is an arithmetic number, because the mean of its divisors is an integer number (2741524290).

Almost surely, 2^21201121002 is an apocalyptic number.

21201121002 is an abundant number, since it is smaller than the sum of its proper divisors (22663267638).

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

21201121002 is a wasteful number, since it uses less digits than its factorization.

21201121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121845557.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21201121002 its reverse (20012110212), we get a palindrome (41213231214).

The spelling of 21201121002 in words is "twenty-one billion, two hundred one million, one hundred twenty-one thousand, two".