211212121031 has 8 divisors (see below), whose sum is σ = 220595097600. Its totient is φ = 201845797912.

The previous prime is 211212120991. The next prime is 211212121067. The reversal of 211212121031 is 130121212112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211212121031 is a prime.

It is a super-2 number, since 2×211212121031² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212121091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4137431 + ... + 4188168.

It is an arithmetic number, because the mean of its divisors is an integer number (27574387200).

Almost surely, 2^211212121031 is an apocalyptic number.

211212121031 is a deficient number, since it is larger than the sum of its proper divisors (9382976569).

211212121031 is a wasteful number, since it uses less digits than its factorization.

211212121031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8326725.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 211212121031 its reverse (130121212112), we get a palindrome (341333333143).

The spelling of 211212121031 in words is "two hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, thirty-one".