20021213002021 has 32 divisors (see below), whose sum is σ = 26047318376448. Its totient is φ = 14922343645440.

The previous prime is 20021213002001. The next prime is 20021213002027. The reversal of 20021213002021 is 12020031212002.

It is a happy number.

It is not a de Polignac number, because 20021213002021 - 2¹⁵ = 20021212969253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021213001986 and 20021213002004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021213002027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130663965 + ... + 130817101.

It is an arithmetic number, because the mean of its divisors is an integer number (813978699264).

Almost surely, 2^{20021213002021} is an apocalyptic number.

It is an amenable number.

20021213002021 is a deficient number, since it is larger than the sum of its proper divisors (6026105374427).

20021213002021 is a wasteful number, since it uses less digits than its factorization.

20021213002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227001.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20021213002021 its reverse (12020031212002), we get a palindrome (32041244214023).

The spelling of 20021213002021 in words is "twenty trillion, twenty-one billion, two hundred thirteen million, two thousand, twenty-one".