31362061620221 has 4 divisors (see below), whose sum is σ = 32209684907292. Its totient is φ = 30514438333152.

The previous prime is 31362061620199. The next prime is 31362061620251. The reversal of 31362061620221 is 12202616026313.

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 26631936856996 + 4730124763225 = 5160614^2 + 2174885^2 .

It is a cyclic number.

It is not a de Polignac number, because 31362061620221 - 2²² = 31362057425917 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 (31362061620251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423811643480 + ... + 423811643553.

It is an arithmetic number, because the mean of its divisors is an integer number (8052421226823).

Almost surely, 2^{31362061620221} is an apocalyptic number.

It is an amenable number.

31362061620221 is a deficient number, since it is larger than the sum of its proper divisors (847623287071).

31362061620221 is an equidigital number, since it uses as much as digits as its factorization.

31362061620221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847623287070.

The product of its (nonzero) digits is 31104, while the sum is 35.

Adding to 31362061620221 its reverse (12202616026313), we get a palindrome (43564677646534).

The spelling of 31362061620221 in words is "thirty-one trillion, three hundred sixty-two billion, sixty-one million, six hundred twenty thousand, two hundred twenty-one".