1212022210021 has 16 divisors (see below), whose sum is σ = 1453467801600. Its totient is φ = 988156187568.

The previous prime is 1212022210013. The next prime is 1212022210043. The reversal of 1212022210021 is 1200122202121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1212022210021 - 2³ = 1212022210013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212022209977 and 1212022210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212022210081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20999361 + ... + 21056998.

It is an arithmetic number, because the mean of its divisors is an integer number (90841737600).

Almost surely, 2^{1212022210021} is an apocalyptic number.

It is an amenable number.

1212022210021 is a deficient number, since it is larger than the sum of its proper divisors (241445591579).

1212022210021 is a wasteful number, since it uses less digits than its factorization.

1212022210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42056568.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1212022210021 its reverse (1200122202121), we get a palindrome (2412144412142).

The spelling of 1212022210021 in words is "one trillion, two hundred twelve billion, twenty-two million, two hundred ten thousand, twenty-one".