1021000220121 has 16 divisors (see below), whose sum is σ = 1556335033344. Its totient is φ = 583231756944.

The previous prime is 1021000220117. The next prime is 1021000220131. The reversal of 1021000220121 is 1210220001201.

It is not a de Polignac number, because 1021000220121 - 2² = 1021000220117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021000220097 and 1021000220106.

It is not an unprimeable number, because it can be changed into a prime (1021000220131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8142141 + ... + 8266586.

It is an arithmetic number, because the mean of its divisors is an integer number (97270939584).

Almost surely, 2^{1021000220121} is an apocalyptic number.

It is an amenable number.

1021000220121 is a deficient number, since it is larger than the sum of its proper divisors (535334813223).

1021000220121 is a wasteful number, since it uses less digits than its factorization.

1021000220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16411700.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1021000220121 its reverse (1210220001201), we get a palindrome (2231220221322).

The spelling of 1021000220121 in words is "one trillion, twenty-one billion, two hundred twenty thousand, one hundred twenty-one".