21123211002 has 16 divisors (see below), whose sum is σ = 42876966432. Its totient is φ = 6935979600.

The previous prime is 21123211001. The next prime is 21123211013. The reversal of 21123211002 is 20011232112.

It is not an unprimeable number, because it can be changed into a prime (21123211001) 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, 26272249 + ... + 26273052.

It is an arithmetic number, because the mean of its divisors is an integer number (2679810402).

Almost surely, 2^21123211002 is an apocalyptic number.

21123211002 is an abundant number, since it is smaller than the sum of its proper divisors (21753755430).

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

21123211002 is a wasteful number, since it uses less digits than its factorization.

21123211002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52545373.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21123211002 its reverse (20011232112), we get a palindrome (41134443114).

The spelling of 21123211002 in words is "twenty-one billion, one hundred twenty-three million, two hundred eleven thousand, two".