10101220021 has 64 divisors (see below), whose sum is σ = 11911276800. Its totient is φ = 8505409536.

The previous prime is 10101220013. The next prime is 10101220043. The reversal of 10101220021 is 12002210101.

It is not a de Polignac number, because 10101220021 - 2³ = 10101220013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10101220121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 73731465 + ... + 73731601.

It is an arithmetic number, because the mean of its divisors is an integer number (186113700).

Almost surely, 2^10101220021 is an apocalyptic number.

It is an amenable number.

10101220021 is a deficient number, since it is larger than the sum of its proper divisors (1810056779).

10101220021 is a wasteful number, since it uses less digits than its factorization.

10101220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358.

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

Adding to 10101220021 its reverse (12002210101), we get a palindrome (22103430122).

The spelling of 10101220021 in words is "ten billion, one hundred one million, two hundred twenty thousand, twenty-one".