21311011002 has 32 divisors (see below), whose sum is σ = 45819878400. Its totient is φ = 6586604208.

The previous prime is 21311010979. The next prime is 21311011003. The reversal of 21311011002 is 20011011312.

It is not an unprimeable number, because it can be changed into a prime (21311011003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1983352 + ... + 1994067.

It is an arithmetic number, because the mean of its divisors is an integer number (1431871200).

Almost surely, 2^21311011002 is an apocalyptic number.

21311011002 is an abundant number, since it is smaller than the sum of its proper divisors (24508867398).

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

21311011002 is a wasteful number, since it uses less digits than its factorization.

21311011002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977490.

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

Adding to 21311011002 its reverse (20011011312), we get a palindrome (41322022314).

The spelling of 21311011002 in words is "twenty-one billion, three hundred eleven million, eleven thousand, two".