1021661124 has 96 divisors (see below), whose sum is σ = 2676989952. Its totient is φ = 300576000.

The previous prime is 1021661119. The next prime is 1021661129. The reversal of 1021661124 is 4211661201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1021661119) and next prime (1021661129).

It is a junction number, because it is equal to n+sod(n) for n = 1021661094 and 1021661103.

It is not an unprimeable number, because it can be changed into a prime (1021661129) 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 31 ways as a sum of consecutive naturals, for example, 1682829 + ... + 1683435.

It is an arithmetic number, because the mean of its divisors is an integer number (27885312).

Almost surely, 2^1021661124 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 1021661124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1338494976).

1021661124 is an abundant number, since it is smaller than the sum of its proper divisors (1655328828).

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

1021661124 is a wasteful number, since it uses less digits than its factorization.

1021661124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977 (or 975 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1021661124 is about 31963.4341709398. The cubic root of 1021661124 is about 1007.1688593142.

The spelling of 1021661124 in words is "one billion, twenty-one million, six hundred sixty-one thousand, one hundred twenty-four".