101212531211 has 4 divisors (see below), whose sum is σ = 110413670424. Its totient is φ = 92011392000.

The previous prime is 101212531193. The next prime is 101212531241. The reversal of 101212531211 is 112135212101.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-101212531211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101212531241) 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, 4600569590 + ... + 4600569611.

It is an arithmetic number, because the mean of its divisors is an integer number (27603417606).

Almost surely, 2^101212531211 is an apocalyptic number.

101212531211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

101212531211 is a deficient number, since it is larger than the sum of its proper divisors (9201139213).

101212531211 is an equidigital number, since it uses as much as digits as its factorization.

101212531211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9201139212.

The product of its (nonzero) digits is 120, while the sum is 20.

Adding to 101212531211 its reverse (112135212101), we get a palindrome (213347743312).

The spelling of 101212531211 in words is "one hundred one billion, two hundred twelve million, five hundred thirty-one thousand, two hundred eleven".