10020212021 has 4 divisors (see below), whose sum is σ = 10072130412. Its totient is φ = 9968293632.

The previous prime is 10020211997. The next prime is 10020212053. The reversal of 10020212021 is 12021202001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12021202001 = 8363 ⋅1437427.

It can be written as a sum of positive squares in 2 ways, for example, as 1712800996 + 8307411025 = 41386^2 + 91145^2 .

It is a cyclic number.

It is not a de Polignac number, because 10020212021 - 2¹⁰ = 10020210997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10020211993 and 10020212011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10020212621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25958906 + ... + 25959291.

It is an arithmetic number, because the mean of its divisors is an integer number (2518032603).

Almost surely, 2^10020212021 is an apocalyptic number.

It is an amenable number.

10020212021 is a deficient number, since it is larger than the sum of its proper divisors (51918391).

10020212021 is an equidigital number, since it uses as much as digits as its factorization.

10020212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51918390.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 10020212021 its reverse (12021202001), we get a palindrome (22041414022).

The spelling of 10020212021 in words is "ten billion, twenty million, two hundred twelve thousand, twenty-one".