20021010111009 has 12 divisors (see below), whose sum is σ = 29852115434752. Its totient is φ = 12916780716600.

The previous prime is 20021010110999. The next prime is 20021010111079. The reversal of 20021010111009 is 90011101012002.

It is a happy number.

It is not a de Polignac number, because 20021010111009 - 2⁴ = 20021010110993 is a prime.

It is a super-2 number, since 2×20021010111009² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021010110982 and 20021010111000.

It is not an unprimeable number, because it can be changed into a prime (20021010111079) 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, 35879946157 + ... + 35879946714.

Almost surely, 2^{20021010111009} is an apocalyptic number.

It is an amenable number.

20021010111009 is a deficient number, since it is larger than the sum of its proper divisors (9831105323743).

20021010111009 is a wasteful number, since it uses less digits than its factorization.

20021010111009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71759892908 (or 71759892905 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The spelling of 20021010111009 in words is "twenty trillion, twenty-one billion, ten million, one hundred eleven thousand, nine".