72020002101221 has 4 divisors (see below), whose sum is σ = 72020128088844. Its totient is φ = 72019876113600.

The previous prime is 72020002101191. The next prime is 72020002101287. The reversal of 72020002101221 is 12210120002027.

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 42577321516900 + 29442680584321 = 6525130^2 + 5426111^2 .

It is a cyclic number.

It is not a de Polignac number, because 72020002101221 - 2²² = 72019997906917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72020002101193 and 72020002101202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72020002161221) 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, 62132420 + ... + 63280941.

It is an arithmetic number, because the mean of its divisors is an integer number (18005032022211).

Almost surely, 2^{72020002101221} is an apocalyptic number.

It is an amenable number.

72020002101221 is a deficient number, since it is larger than the sum of its proper divisors (125987623).

72020002101221 is a wasteful number, since it uses less digits than its factorization.

72020002101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125987622.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 72020002101221 its reverse (12210120002027), we get a palindrome (84230122103248).

The spelling of 72020002101221 in words is "seventy-two trillion, twenty billion, two million, one hundred one thousand, two hundred twenty-one".