21131211002 has 16 divisors (see below), whose sum is σ = 34581861792. Its totient is φ = 9604119120.

The previous prime is 21131210983. The next prime is 21131211047. The reversal of 21131211002 is 20011213112.

It is a super-2 number, since 2×21131211002² (a number of 21 digits) contains 22 as substring.

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, 200753 + ... + 287339.

It is an arithmetic number, because the mean of its divisors is an integer number (2161366362).

Almost surely, 2^21131211002 is an apocalyptic number.

21131211002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21131211002 is a deficient number, since it is larger than the sum of its proper divisors (13450650790).

21131211002 is a wasteful number, since it uses less digits than its factorization.

21131211002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97693.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21131211002 its reverse (20011213112), we get a palindrome (41142424114).

It can be divided in two parts, 211 and 31211002, that added together give a palindrome (31211213).

The spelling of 21131211002 in words is "twenty-one billion, one hundred thirty-one million, two hundred eleven thousand, two".