1011213101221 has 4 divisors (see below), whose sum is σ = 1013559303744. Its totient is φ = 1008866898700.

The previous prime is 1011213101209. The next prime is 1011213101309. The reversal of 1011213101221 is 1221013121101.

It is a happy number.

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 1011213101221 - 2⁵ = 1011213101189 is a prime.

It is a super-3 number, since 3×1011213101221³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011213101195 and 1011213101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011223101221) 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, 1173100615 + ... + 1173101476.

It is an arithmetic number, because the mean of its divisors is an integer number (253389825936).

Almost surely, 2^{1011213101221} is an apocalyptic number.

It is an amenable number.

1011213101221 is a deficient number, since it is larger than the sum of its proper divisors (2346202523).

1011213101221 is an equidigital number, since it uses as much as digits as its factorization.

1011213101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346202522.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1011213101221 its reverse (1221013121101), we get a palindrome (2232226222322).

The spelling of 1011213101221 in words is "one trillion, eleven billion, two hundred thirteen million, one hundred one thousand, two hundred twenty-one".