1021011994 has 8 divisors (see below), whose sum is σ = 1539292788. Its totient is φ = 507914400.

The previous prime is 1021011991. The next prime is 1021012033. The reversal of 1021011994 is 4991101201.

It can be written as a sum of positive squares in 2 ways, for example, as 659821969 + 361190025 = 25687^2 + 19005^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1021011991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1295307 + ... + 1296094.

Almost surely, 2^1021011994 is an apocalyptic number.

1021011994 is a deficient number, since it is larger than the sum of its proper divisors (518280794).

1021011994 is a wasteful number, since it uses less digits than its factorization.

1021011994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591600.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1021011994 is about 31953.2782981653. The cubic root of 1021011994 is about 1006.9555067587.

The spelling of 1021011994 in words is "one billion, twenty-one million, eleven thousand, nine hundred ninety-four".