1021121244 has 144 divisors (see below), whose sum is σ = 3056376960. Its totient is φ = 283374720.

The previous prime is 1021121243. The next prime is 1021121251. The reversal of 1021121244 is 4421211201.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021121243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 714859 + ... + 716285.

It is an arithmetic number, because the mean of its divisors is an integer number (21224840).

Almost surely, 2^1021121244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021121244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1528188480).

1021121244 is an abundant number, since it is smaller than the sum of its proper divisors (2035255716).

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

1021121244 is a wasteful number, since it uses less digits than its factorization.

1021121244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600 (or 1595 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1021121244 is about 31954.9877796879. The cubic root of 1021121244 is about 1006.9914207886.

Adding to 1021121244 its reverse (4421211201), we get a palindrome (5442332445).

It can be divided in two parts, 1021 and 121244, that added together give a triangular number (122265 = T₄₉₄).

The spelling of 1021121244 in words is "one billion, twenty-one million, one hundred twenty-one thousand, two hundred forty-four".