21002012100010 has 64 divisors (see below), whose sum is σ = 39554264010240. Its totient is φ = 8013784078080.

The previous prime is 21002012099989. The next prime is 21002012100011. The reversal of 21002012100010 is 1000121020012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 21002012100010.

It is not an unprimeable number, because it can be changed into a prime (21002012100011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127470844 + ... + 127635496.

It is an arithmetic number, because the mean of its divisors is an integer number (618035375160).

Almost surely, 2^{21002012100010} is an apocalyptic number.

21002012100010 is a deficient number, since it is larger than the sum of its proper divisors (18552251910230).

21002012100010 is a wasteful number, since it uses less digits than its factorization.

21002012100010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166183.

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

Adding to 21002012100010 its reverse (1000121020012), we get a palindrome (22002133120022).

The spelling of 21002012100010 in words is "twenty-one trillion, two billion, twelve million, one hundred thousand, ten".