1021188942 has 24 divisors (see below), whose sum is σ = 2245602216. Its totient is φ = 335315376.

The previous prime is 1021188941. The next prime is 1021188943. The reversal of 1021188942 is 2498811201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1021188941) and next prime (1021188943).

It is a junction number, because it is equal to n+sod(n) for n = 1021188897 and 1021188906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021188941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 422173 + ... + 424584.

It is an arithmetic number, because the mean of its divisors is an integer number (93566759).

Almost surely, 2^1021188942 is an apocalyptic number.

1021188942 is an abundant number, since it is smaller than the sum of its proper divisors (1224413274).

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

1021188942 is a wasteful number, since it uses less digits than its factorization.

1021188942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846832 (or 846829 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1021188942 is about 31956.0470333863. The cubic root of 1021188942 is about 1007.0136740385.

The spelling of 1021188942 in words is "one billion, twenty-one million, one hundred eighty-eight thousand, nine hundred forty-two".