1021121012021 has 24 divisors (see below), whose sum is σ = 1177414870464. Its totient is φ = 878125328640.

The previous prime is 1021121011987. The next prime is 1021121012047. The reversal of 1021121012021 is 1202101211201.

It is not a de Polignac number, because 1021121012021 - 2⁶ = 1021121011957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021121011987 and 1021121012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021121012321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2481440 + ... + 2863526.

It is an arithmetic number, because the mean of its divisors is an integer number (49058952936).

Almost surely, 2^{1021121012021} is an apocalyptic number.

1021121012021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021121012021 is a deficient number, since it is larger than the sum of its proper divisors (156293858443).

1021121012021 is a wasteful number, since it uses less digits than its factorization.

1021121012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382809 (or 382790 counting only the distinct ones).

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

Adding to 1021121012021 its reverse (1202101211201), we get a palindrome (2223222223222).

The spelling of 1021121012021 in words is "one trillion, twenty-one billion, one hundred twenty-one million, twelve thousand, twenty-one".