1211202211021 has 8 divisors (see below), whose sum is σ = 1328693133600. Its totient is φ = 1094941560240.

The previous prime is 1211202211013. The next prime is 1211202211033. The reversal of 1211202211021 is 1201122021121.

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

It is not a de Polignac number, because 1211202211021 - 2³ = 1211202211013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211202210986 and 1211202211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211202211061) 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, 307565886 + ... + 307569823.

It is an arithmetic number, because the mean of its divisors is an integer number (166086641700).

Almost surely, 2^{1211202211021} is an apocalyptic number.

1211202211021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211202211021 is a deficient number, since it is larger than the sum of its proper divisors (117490922579).

1211202211021 is a wasteful number, since it uses less digits than its factorization.

1211202211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615135899.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211202211021 its reverse (1201122021121), we get a palindrome (2412324232142).

The spelling of 1211202211021 in words is "one trillion, two hundred eleven billion, two hundred two million, two hundred eleven thousand, twenty-one".