21020210010100 has 36 divisors (see below), whose sum is σ = 52130120826784. Its totient is φ = 7206929146080.

The previous prime is 21020210010097. The next prime is 21020210010143. The reversal of 21020210010100 is 101001202012.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15014435022 + ... + 15014436421.

Almost surely, 2^{21020210010100} is an apocalyptic number.

21020210010100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020210010100 is an abundant number, since it is smaller than the sum of its proper divisors (31109910816684).

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

21020210010100 is a wasteful number, since it uses less digits than its factorization.

21020210010100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30028871464 (or 30028871457 counting only the distinct ones).

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

Adding to 21020210010100 its reverse (101001202012), we get a palindrome (21121211212112).

The spelling of 21020210010100 in words is "twenty-one trillion, twenty billion, two hundred ten million, ten thousand, one hundred".