21012012101002 has 16 divisors (see below), whose sum is σ = 34859845441512. Its totient is φ = 9435747637440.

The previous prime is 21012012100997. The next prime is 21012012101011. The reversal of 21012012101002 is 20010121021012.

It can be written as a sum of positive squares in 4 ways, for example, as 11880368197681 + 9131643903321 = 3446791^2 + 3021861^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

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, 10921003249 + ... + 10921005172.

Almost surely, 2^{21012012101002} is an apocalyptic number.

21012012101002 is a deficient number, since it is larger than the sum of its proper divisors (13847833340510).

21012012101002 is a wasteful number, since it uses less digits than its factorization.

21012012101002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21842008473.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21012012101002 its reverse (20010121021012), we get a palindrome (41022133122014).

The spelling of 21012012101002 in words is "twenty-one trillion, twelve billion, twelve million, one hundred one thousand, two".