1021123290 has 64 divisors (see below), whose sum is σ = 2690651520. Its totient is φ = 245955840.

The previous prime is 1021123211. The next prime is 1021123333. The reversal of 1021123290 is 923211201.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41956 + ... + 61664.

It is an arithmetic number, because the mean of its divisors is an integer number (42041430).

Almost surely, 2^1021123290 is an apocalyptic number.

1021123290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021123290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1345325760).

1021123290 is an abundant number, since it is smaller than the sum of its proper divisors (1669528230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021123290 is a wasteful number, since it uses less digits than its factorization.

1021123290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19887.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1021123290 is about 31955.0197934534. The cubic root of 1021123290 is about 1006.9920933509.

Adding to 1021123290 its reverse (923211201), we get a palindrome (1944334491).

The spelling of 1021123290 in words is "one billion, twenty-one million, one hundred twenty-three thousand, two hundred ninety".