20110021219973 has 4 divisors (see below), whose sum is σ = 20489455582668. Its totient is φ = 19730586857280.

The previous prime is 20110021219963. The next prime is 20110021219979. The reversal of 20110021219973 is 37991212001102.

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 2 ways, for example, as 15068231495524 + 5041789724449 = 3881782^2 + 2245393^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20110021219973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110021219979) 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, 189717181268 + ... + 189717181373.

It is an arithmetic number, because the mean of its divisors is an integer number (5122363895667).

Almost surely, 2^{20110021219973} is an apocalyptic number.

It is an amenable number.

20110021219973 is a deficient number, since it is larger than the sum of its proper divisors (379434362695).

20110021219973 is an equidigital number, since it uses as much as digits as its factorization.

20110021219973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379434362694.

The product of its (nonzero) digits is 13608, while the sum is 38.

The spelling of 20110021219973 in words is "twenty trillion, one hundred ten billion, twenty-one million, two hundred nineteen thousand, nine hundred seventy-three".