1212233111021 has 4 divisors (see below), whose sum is σ = 1212235389792. Its totient is φ = 1212230832252.

The previous prime is 1212233111009. The next prime is 1212233111029. The reversal of 1212233111021 is 1201113322121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1212233111021 - 2¹⁸ = 1212232848877 is a prime.

It is a super-2 number, since 2×1212233111021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212233110984 and 1212233111002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212233111029) 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, 129896 + ... + 1562478.

It is an arithmetic number, because the mean of its divisors is an integer number (303058847448).

Almost surely, 2^{1212233111021} is an apocalyptic number.

It is an amenable number.

1212233111021 is a deficient number, since it is larger than the sum of its proper divisors (2278771).

1212233111021 is an equidigital number, since it uses as much as digits as its factorization.

1212233111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278770.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1212233111021 its reverse (1201113322121), we get a palindrome (2413346433142).

The spelling of 1212233111021 in words is "one trillion, two hundred twelve billion, two hundred thirty-three million, one hundred eleven thousand, twenty-one".