21012020220102 has 64 divisors (see below), whose sum is σ = 44873002598400. Its totient is φ = 6539858105760.

The previous prime is 21012020220101. The next prime is 21012020220203. The reversal of 21012020220102 is 20102202021012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012020220101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25388299 + ... + 26202857.

It is an arithmetic number, because the mean of its divisors is an integer number (701140665600).

Almost surely, 2^{21012020220102} is an apocalyptic number.

21012020220102 is an abundant number, since it is smaller than the sum of its proper divisors (23860982378298).

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

21012020220102 is a wasteful number, since it uses less digits than its factorization.

21012020220102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817841.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21012020220102 its reverse (20102202021012), we get a palindrome (41114222241114).

The spelling of 21012020220102 in words is "twenty-one trillion, twelve billion, twenty million, two hundred twenty thousand, one hundred two".