21020221210102 has 4 divisors (see below), whose sum is σ = 31530331815156. Its totient is φ = 10510110605050.

The previous prime is 21020221210091. The next prime is 21020221210117. The reversal of 21020221210102 is 20101212202012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×21020221210102³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255055302524 + ... + 5255055302527.

It is an arithmetic number, because the mean of its divisors is an integer number (7882582953789).

Almost surely, 2^{21020221210102} is an apocalyptic number.

21020221210102 is a deficient number, since it is larger than the sum of its proper divisors (10510110605054).

21020221210102 is a wasteful number, since it uses less digits than its factorization.

21020221210102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10510110605053.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21020221210102 its reverse (20101212202012), we get a palindrome (41121433412114).

The spelling of 21020221210102 in words is "twenty-one trillion, twenty billion, two hundred twenty-one million, two hundred ten thousand, one hundred two".