1212021101 has 4 divisors (see below), whose sum is σ = 1237808832. Its totient is φ = 1186233372.

The previous prime is 1212021073. The next prime is 1212021113. The reversal of 1212021101 is 1011202121.

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 1212021101 - 2¹⁰ = 1212020077 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 (1212071101) 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, 12893795 + ... + 12893888.

It is an arithmetic number, because the mean of its divisors is an integer number (309452208).

Almost surely, 2^1212021101 is an apocalyptic number.

It is an amenable number.

1212021101 is a deficient number, since it is larger than the sum of its proper divisors (25787731).

1212021101 is an equidigital number, since it uses as much as digits as its factorization.

1212021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25787730.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1212021101 is about 34814.0934249335. The cubic root of 1212021101 is about 1066.1952096957.

Adding to 1212021101 its reverse (1011202121), we get a palindrome (2223223222).

The spelling of 1212021101 in words is "one billion, two hundred twelve million, twenty-one thousand, one hundred one".