21020020102102 has 32 divisors (see below), whose sum is σ = 36406612892160. Its totient is φ = 8915510972160.

The previous prime is 21020020102093. The next prime is 21020020102117. The reversal of 21020020102102 is 20120102002012.

It is a happy number.

It is a congruent number.

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, 72697477 + ... + 72986047.

It is an arithmetic number, because the mean of its divisors is an integer number (1137706652880).

Almost surely, 2^{21020020102102} is an apocalyptic number.

21020020102102 is a deficient number, since it is larger than the sum of its proper divisors (15386592790058).

21020020102102 is a wasteful number, since it uses less digits than its factorization.

21020020102102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342316.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21020020102102 its reverse (20120102002012), we get a palindrome (41140122104114).

The spelling of 21020020102102 in words is "twenty-one trillion, twenty billion, twenty million, one hundred two thousand, one hundred two".