1023121021 has 16 divisors (see below), whose sum is σ = 1132499200. Its totient is φ = 918485568.

The previous prime is 1023121019. The next prime is 1023121027. The reversal of 1023121021 is 1201213201.

It is not a de Polignac number, because 1023121021 - 2¹ = 1023121019 is a prime.

It is a super-2 number, since 2×1023121021² = 2093553247224164882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1023120992 and 1023121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023121027) 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, 61375 + ... + 76243.

It is an arithmetic number, because the mean of its divisors is an integer number (70781200).

Almost surely, 2^1023121021 is an apocalyptic number.

It is an amenable number.

1023121021 is a deficient number, since it is larger than the sum of its proper divisors (109378179).

1023121021 is a wasteful number, since it uses less digits than its factorization.

1023121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15028.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1023121021 is about 31986.2630046087. The cubic root of 1023121021 is about 1007.6483604460.

Adding to 1023121021 its reverse (1201213201), we get a palindrome (2224334222).

The spelling of 1023121021 in words is "one billion, twenty-three million, one hundred twenty-one thousand, twenty-one".