1211202210021 has 8 divisors (see below), whose sum is σ = 1670623738080. Its totient is φ = 779624410992.

The previous prime is 1211202209981. The next prime is 1211202210107. The reversal of 1211202210021 is 1200122021121.

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

It is not a de Polignac number, because 1211202210021 - 2¹⁷ = 1211202078949 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211202210221) 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, 6960932155 + ... + 6960932328.

It is an arithmetic number, because the mean of its divisors is an integer number (208827967260).

Almost surely, 2^{1211202210021} is an apocalyptic number.

It is an amenable number.

1211202210021 is a deficient number, since it is larger than the sum of its proper divisors (459421528059).

1211202210021 is a wasteful number, since it uses less digits than its factorization.

1211202210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13921864515.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1211202210021 its reverse (1200122021121), we get a palindrome (2411324231142).

The spelling of 1211202210021 in words is "one trillion, two hundred eleven billion, two hundred two million, two hundred ten thousand, twenty-one".