20213002021 has 4 divisors (see below), whose sum is σ = 20325924000. Its totient is φ = 20100080044.

The previous prime is 20213002003. The next prime is 20213002063. The reversal of 20213002021 is 12020031202.

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 20213002021 - 2¹⁷ = 20212870949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20213001992 and 20213002010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213002081) 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 3 ways as a sum of consecutive naturals, for example, 56460721 + ... + 56461078.

It is an arithmetic number, because the mean of its divisors is an integer number (5081481000).

Almost surely, 2^20213002021 is an apocalyptic number.

It is an amenable number.

20213002021 is a deficient number, since it is larger than the sum of its proper divisors (112921979).

20213002021 is a wasteful number, since it uses less digits than its factorization.

20213002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112921978.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20213002021 its reverse (12020031202), we get a palindrome (32233033223).

The spelling of 20213002021 in words is "twenty billion, two hundred thirteen million, two thousand, twenty-one".