1011210021221 has 16 divisors (see below), whose sum is σ = 1027279915200. Its totient is φ = 995301917568.

The previous prime is 1011210021181. The next prime is 1011210021253. The reversal of 1011210021221 is 1221200121101.

1011210021221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011210021221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011210021196 and 1011210021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011210021271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7684145 + ... + 7814633.

It is an arithmetic number, because the mean of its divisors is an integer number (64204994700).

Almost surely, 2^{1011210021221} is an apocalyptic number.

It is an amenable number.

1011210021221 is a deficient number, since it is larger than the sum of its proper divisors (16069893979).

1011210021221 is a wasteful number, since it uses less digits than its factorization.

1011210021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131108.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1011210021221 its reverse (1221200121101), we get a palindrome (2232410142322).

The spelling of 1011210021221 in words is "one trillion, eleven billion, two hundred ten million, twenty-one thousand, two hundred twenty-one".