1021212312021 has 32 divisors (see below), whose sum is σ = 1650630051840. Its totient is φ = 618846836400.

The previous prime is 1021212312011. The next prime is 1021212312073. The reversal of 1021212312021 is 1202132121201.

It is not a de Polignac number, because 1021212312021 - 2⁵ = 1021212311989 is a prime.

It is a super-2 number, since 2×1021212312021² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021212311985 and 1021212312003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021212312011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2510916 + ... + 2889138.

It is an arithmetic number, because the mean of its divisors is an integer number (51582189120).

Almost surely, 2^{1021212312021} is an apocalyptic number.

1021212312021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021212312021 is a deficient number, since it is larger than the sum of its proper divisors (629417739819).

1021212312021 is a wasteful number, since it uses less digits than its factorization.

1021212312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387334 (or 387328 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1021212312021 its reverse (1202132121201), we get a palindrome (2223344433222).

It can be divided in two parts, 102121 and 2312021, that added together give a palindrome (2414142).

The spelling of 1021212312021 in words is "one trillion, twenty-one billion, two hundred twelve million, three hundred twelve thousand, twenty-one".