1011121212021 has 64 divisors (see below), whose sum is σ = 1458752716800. Its totient is φ = 621147384000.

The previous prime is 1011121212007. The next prime is 1011121212061. The reversal of 1011121212021 is 1202121211101.

It is a happy number.

It is not a de Polignac number, because 1011121212021 - 2⁹ = 1011121211509 is a prime.

It is a super-2 number, since 2×1011121212021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011121212061) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 552222576 + ... + 552224406.

It is an arithmetic number, because the mean of its divisors is an integer number (22793011200).

Almost surely, 2^{1011121212021} is an apocalyptic number.

It is an amenable number.

1011121212021 is a deficient number, since it is larger than the sum of its proper divisors (447631504779).

1011121212021 is a wasteful number, since it uses less digits than its factorization.

1011121212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2918.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1011121212021 its reverse (1202121211101), we get a palindrome (2213242423122).

The spelling of 1011121212021 in words is "one trillion, eleven billion, one hundred twenty-one million, two hundred twelve thousand, twenty-one".