31100020212021 has 32 divisors (see below), whose sum is σ = 43413894051840. Its totient is φ = 19765796635200.

The previous prime is 31100020211987. The next prime is 31100020212029. The reversal of 31100020212021 is 12021202000113.

It is not a de Polignac number, because 31100020212021 - 2¹⁵ = 31100020179253 is a prime.

It is a super-2 number, since 2×31100020212021² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31100020212029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73353040 + ... + 73775798.

It is an arithmetic number, because the mean of its divisors is an integer number (1356684189120).

Almost surely, 2^{31100020212021} is an apocalyptic number.

It is an amenable number.

31100020212021 is a deficient number, since it is larger than the sum of its proper divisors (12313873839819).

31100020212021 is a wasteful number, since it uses less digits than its factorization.

31100020212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426337.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 31100020212021 its reverse (12021202000113), we get a palindrome (43121222212134).

The spelling of 31100020212021 in words is "thirty-one trillion, one hundred billion, twenty million, two hundred twelve thousand, twenty-one".