1023220121 has 16 divisors (see below), whose sum is σ = 1293677568. Its totient is φ = 786080400.

The previous prime is 1023220111. The next prime is 1023220141. The reversal of 1023220121 is 1210223201.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1023220121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1023220096 and 1023220105.

It is not an unprimeable number, because it can be changed into a prime (1023220111) 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, 88115 + ... + 99048.

It is an arithmetic number, because the mean of its divisors is an integer number (80854848).

Almost surely, 2^1023220121 is an apocalyptic number.

1023220121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1023220121 is a deficient number, since it is larger than the sum of its proper divisors (270457447).

1023220121 is a wasteful number, since it uses less digits than its factorization.

1023220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187252.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1023220121 is about 31987.8120695993. The cubic root of 1023220121 is about 1007.6808931659.

Adding to 1023220121 its reverse (1210223201), we get a palindrome (2233443322).

It can be divided in two parts, 102 and 3220121, that added together give a palindrome (3220223).

The spelling of 1023220121 in words is "one billion, twenty-three million, two hundred twenty thousand, one hundred twenty-one".