1021112120021 has 16 divisors (see below), whose sum is σ = 1228466716800. Its totient is φ = 829132469568.

The previous prime is 1021112120003. The next prime is 1021112120033. The reversal of 1021112120021 is 1200212111201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021112120021 is a prime.

It is a super-2 number, since 2×1021112120021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021112119978 and 1021112120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021112120221) 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, 2648291 + ... + 3009263.

It is an arithmetic number, because the mean of its divisors is an integer number (76779169800).

Almost surely, 2^{1021112120021} is an apocalyptic number.

It is an amenable number.

1021112120021 is a deficient number, since it is larger than the sum of its proper divisors (207354596779).

1021112120021 is a wasteful number, since it uses less digits than its factorization.

1021112120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382268.

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

Adding to 1021112120021 its reverse (1200212111201), we get a palindrome (2221324231222).

The spelling of 1021112120021 in words is "one trillion, twenty-one billion, one hundred twelve million, one hundred twenty thousand, twenty-one".