1212213101 has 12 divisors (see below), whose sum is σ = 1404782880. Its totient is φ = 1037184960.

The previous prime is 1212213097. The next prime is 1212213133. The reversal of 1212213101 is 1013122121.

It is not a de Polignac number, because 1212213101 - 2² = 1212213097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212213151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187481 + ... + 193838.

It is an arithmetic number, because the mean of its divisors is an integer number (117065240).

Almost surely, 2^1212213101 is an apocalyptic number.

1212213101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212213101 is a deficient number, since it is larger than the sum of its proper divisors (192569779).

1212213101 is a wasteful number, since it uses less digits than its factorization.

1212213101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381364 (or 381347 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1212213101 is about 34816.8508196821. The cubic root of 1212213101 is about 1066.2515064801.

Adding to 1212213101 its reverse (1013122121), we get a palindrome (2225335222).

The spelling of 1212213101 in words is "one billion, two hundred twelve million, two hundred thirteen thousand, one hundred one".