21002100011002 has 32 divisors (see below), whose sum is σ = 36496643713920. Its totient is φ = 8958194273280.

The previous prime is 21002100010993. The next prime is 21002100011041. The reversal of 21002100011002 is 20011000120012.

It is a self number, because there is not a number n which added to its sum of digits gives 21002100011002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83190502 + ... + 83442577.

It is an arithmetic number, because the mean of its divisors is an integer number (1140520116060).

Almost surely, 2^{21002100011002} is an apocalyptic number.

21002100011002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21002100011002 is a deficient number, since it is larger than the sum of its proper divisors (15494543702918).

21002100011002 is a wasteful number, since it uses less digits than its factorization.

21002100011002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166633446.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21002100011002 its reverse (20011000120012), we get a palindrome (41013100131014).

The spelling of 21002100011002 in words is "twenty-one trillion, two billion, one hundred million, eleven thousand, two".