101210220021 has 16 divisors (see below), whose sum is σ = 138309171264. Its totient is φ = 65797463424.

The previous prime is 101210220011. The next prime is 101210220037. The reversal of 101210220021 is 120022012101.

It is not a de Polignac number, because 101210220021 - 2¹³ = 101210211829 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 101210219979 and 101210220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101210220011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556206 + ... + 715391.

It is an arithmetic number, because the mean of its divisors is an integer number (8644323204).

Almost surely, 2^101210220021 is an apocalyptic number.

It is an amenable number.

101210220021 is a deficient number, since it is larger than the sum of its proper divisors (37098951243).

101210220021 is a wasteful number, since it uses less digits than its factorization.

101210220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272260.

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

Adding to 101210220021 its reverse (120022012101), we get a palindrome (221232232122).

The spelling of 101210220021 in words is "one hundred one billion, two hundred ten million, two hundred twenty thousand, twenty-one".