101220210021 has 16 divisors (see below), whose sum is σ = 154278080000. Its totient is φ = 57825960048.

The previous prime is 101220210011. The next prime is 101220210037. The reversal of 101220210021 is 120012022101.

It is not a de Polignac number, because 101220210021 - 2⁹ = 101220209509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101220209979 and 101220210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101220210011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 501871 + ... + 674028.

It is an arithmetic number, because the mean of its divisors is an integer number (9642380000).

Almost surely, 2^101220210021 is an apocalyptic number.

It is an amenable number.

101220210021 is a deficient number, since it is larger than the sum of its proper divisors (53057869979).

101220210021 is a wasteful number, since it uses less digits than its factorization.

101220210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180008.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 101220210021 its reverse (120012022101), we get a palindrome (221232232122).

The spelling of 101220210021 in words is "one hundred one billion, two hundred twenty million, two hundred ten thousand, twenty-one".