1211202122021 has 8 divisors (see below), whose sum is σ = 1264570380864. Its totient is φ = 1157892804640.

The previous prime is 1211202122017. The next prime is 1211202122029. The reversal of 1211202122021 is 1202212021121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211202122021 - 2² = 1211202122017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211202122029) 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, 14693360 + ... + 14775561.

It is an arithmetic number, because the mean of its divisors is an integer number (158071297608).

Almost surely, 2^{1211202122021} is an apocalyptic number.

It is an amenable number.

1211202122021 is a deficient number, since it is larger than the sum of its proper divisors (53368258843).

1211202122021 is a wasteful number, since it uses less digits than its factorization.

1211202122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29470731.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1211202122021 its reverse (1202212021121), we get a palindrome (2413414143142).

The spelling of 1211202122021 in words is "one trillion, two hundred eleven billion, two hundred two million, one hundred twenty-two thousand, twenty-one".