2021000220121 has 4 divisors (see below), whose sum is σ = 2055254461200.
Its totient is φ = 1986745979044.
The previous prime is 2021000220091. The next prime is 2021000220139. The reversal of 2021000220121 is 1210220001202.
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 2021000220121 - 213 = 2021000211929 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (2021000220721) 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, 17127120451 + ... + 17127120568.
It is an arithmetic number, because the mean of its divisors is an integer number (513813615300).
Almost surely, 22021000220121 is an apocalyptic number.
It is an amenable number.
2021000220121 is a deficient number, since it is larger than the sum of its proper divisors (34254241079).
2021000220121 is an equidigital number, since it uses as much as digits as its factorization.
2021000220121 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 34254241078.
The product of its (nonzero) digits is 32, while the sum is 13.
Adding to 2021000220121 its reverse (1210220001202), we get a palindrome (3231220221323).
The spelling of 2021000220121 in words is "two trillion, twenty-one billion, two hundred twenty thousand, one hundred twenty-one".