20021010994 has 4 divisors (see below), whose sum is σ = 30031516494. Its totient is φ = 10010505496.

The previous prime is 20021010983. The next prime is 20021011007. The reversal of 20021010994 is 49901012002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19797897025 + 223113969 = 140705^2 + 14937^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005252747 + ... + 5005252750.

Almost surely, 2^20021010994 is an apocalyptic number.

20021010994 is a deficient number, since it is larger than the sum of its proper divisors (10010505500).

20021010994 is a wasteful number, since it uses less digits than its factorization.

20021010994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010505499.

The product of its (nonzero) digits is 1296, while the sum is 28.

Adding to 20021010994 its reverse (49901012002), we get a palindrome (69922022996).

The spelling of 20021010994 in words is "twenty billion, twenty-one million, ten thousand, nine hundred ninety-four".