202012110100021 has 8 divisors (see below), whose sum is σ = 217557657372440. Its totient is φ = 186467441997312.

The previous prime is 202012110099979. The next prime is 202012110100103. The reversal of 202012110100021 is 120001011210202.

It can be written as a sum of positive squares in 4 ways, for example, as 104996110991121 + 97015999108900 = 10246761^2 + 9849670^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 202012110100021 - 2²⁷ = 202011975882293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202012110099974 and 202012110100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202012110100621) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 219315156 + ... + 220234333.

It is an arithmetic number, because the mean of its divisors is an integer number (27194707171555).

Almost surely, 2^{202012110100021} is an apocalyptic number.

It is an amenable number.

202012110100021 is a deficient number, since it is larger than the sum of its proper divisors (15545547272419).

202012110100021 is a wasteful number, since it uses less digits than its factorization.

202012110100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439584855.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 202012110100021 its reverse (120001011210202), we get a palindrome (322013121310223).

The spelling of 202012110100021 in words is "two hundred two trillion, twelve billion, one hundred ten million, one hundred thousand, twenty-one".