1021661142 has 16 divisors (see below), whose sum is σ = 2062069680. Its totient is φ = 337429152.

The previous prime is 1021661129. The next prime is 1021661159. The reversal of 1021661142 is 2411661201.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 780433 + ... + 781740.

It is an arithmetic number, because the mean of its divisors is an integer number (128879355).

Almost surely, 2^1021661142 is an apocalyptic number.

1021661142 is an abundant number, since it is smaller than the sum of its proper divisors (1040408538).

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

1021661142 is a wasteful number, since it uses less digits than its factorization.

1021661142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562287.

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

The square root of 1021661142 is about 31963.4344525115. The cubic root of 1021661142 is about 1007.1688652291.

The spelling of 1021661142 in words is "one billion, twenty-one million, six hundred sixty-one thousand, one hundred forty-two".