1021129993 has 8 divisors (see below), whose sum is σ = 1112928768. Its totient is φ = 931224144.

The previous prime is 1021129981. The next prime is 1021130003. The reversal of 1021129993 is 3999211201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1021129993 - 2¹⁷ = 1020998921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021129393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472105 + ... + 474262.

It is an arithmetic number, because the mean of its divisors is an integer number (139116096).

Almost surely, 2^1021129993 is an apocalyptic number.

1021129993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1021129993 is a deficient number, since it is larger than the sum of its proper divisors (91798775).

1021129993 is an equidigital number, since it uses as much as digits as its factorization.

1021129993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946463.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 1021129993 is about 31955.1246750815. The cubic root of 1021129993 is about 1006.9942967587.

It can be divided in two parts, 10211 and 29993, that added together give a palindrome (40204).

The spelling of 1021129993 in words is "one billion, twenty-one million, one hundred twenty-nine thousand, nine hundred ninety-three".