212002021021 has 4 divisors (see below), whose sum is σ = 242288024032. Its totient is φ = 181716018012.

The previous prime is 212002021019. The next prime is 212002021031. The reversal of 212002021021 is 120120200212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212002021021 - 2¹ = 212002021019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212002020992 and 212002021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212002021031) 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, 15143001495 + ... + 15143001508.

It is an arithmetic number, because the mean of its divisors is an integer number (60572006008).

Almost surely, 2^212002021021 is an apocalyptic number.

It is an amenable number.

212002021021 is a deficient number, since it is larger than the sum of its proper divisors (30286003011).

212002021021 is an equidigital number, since it uses as much as digits as its factorization.

212002021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30286003010.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 212002021021 its reverse (120120200212), we get a palindrome (332122221233).

The spelling of 212002021021 in words is "two hundred twelve billion, two million, twenty-one thousand, twenty-one".