21125011002 has 32 divisors (see below), whose sum is σ = 44827281792. Its totient is φ = 6613830144.

The previous prime is 21125011001. The next prime is 21125011003. The reversal of 21125011002 is 20011052112.

It is an interprime number because it is at equal distance from previous prime (21125011001) and next prime (21125011003).

It is not an unprimeable number, because it can be changed into a prime (21125011001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162963 + ... + 262310.

It is an arithmetic number, because the mean of its divisors is an integer number (1400852556).

Almost surely, 2^21125011002 is an apocalyptic number.

21125011002 is an abundant number, since it is smaller than the sum of its proper divisors (23702270790).

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

21125011002 is a wasteful number, since it uses less digits than its factorization.

21125011002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425782.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 21125011002 its reverse (20011052112), we get a palindrome (41136063114).

The spelling of 21125011002 in words is "twenty-one billion, one hundred twenty-five million, eleven thousand, two".