21231130002 has 32 divisors (see below), whose sum is σ = 42618398400. Its totient is φ = 7051070208.

The previous prime is 21231129973. The next prime is 21231130009. The reversal of 21231130002 is 20003113212.

It is not an unprimeable number, because it can be changed into a prime (21231130009) 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, 1861774 + ... + 1873142.

It is an arithmetic number, because the mean of its divisors is an integer number (1331824950).

Almost surely, 2^21231130002 is an apocalyptic number.

21231130002 is an abundant number, since it is smaller than the sum of its proper divisors (21387268398).

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

21231130002 is a wasteful number, since it uses less digits than its factorization.

21231130002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12490.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21231130002 its reverse (20003113212), we get a palindrome (41234243214).

The spelling of 21231130002 in words is "twenty-one billion, two hundred thirty-one million, one hundred thirty thousand, two".