1021020220121 has 16 divisors (see below), whose sum is σ = 1130855705280. Its totient is φ = 914030230080.

The previous prime is 1021020220117. The next prime is 1021020220139. The reversal of 1021020220121 is 1210220201201.

It is not a de Polignac number, because 1021020220121 - 2² = 1021020220117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021020220096 and 1021020220105.

It is not an unprimeable number, because it can be changed into a prime (1021020220421) 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, 1905815 + ... + 2382051.

It is an arithmetic number, because the mean of its divisors is an integer number (70678481580).

Almost surely, 2^{1021020220121} is an apocalyptic number.

1021020220121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021020220121 is a deficient number, since it is larger than the sum of its proper divisors (109835485159).

1021020220121 is a wasteful number, since it uses less digits than its factorization.

1021020220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479224.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1021020220121 its reverse (1210220201201), we get a palindrome (2231240421322).

The spelling of 1021020220121 in words is "one trillion, twenty-one billion, twenty million, two hundred twenty thousand, one hundred twenty-one".