1021023213012 has 240 divisors, whose sum is σ = 3004202101824. Its totient is φ = 302200113600.

The previous prime is 1021023212981. The next prime is 1021023213107. The reversal of 1021023213012 is 2103123201201.

It is a super-2 number, since 2×1021023213012² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 18515962 + ... + 18571022.

Almost surely, 2^{1021023213012} is an apocalyptic number.

1021023213012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021023213012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1502101050912).

1021023213012 is an abundant number, since it is smaller than the sum of its proper divisors (1983178888812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021023213012 is a wasteful number, since it uses less digits than its factorization.

1021023213012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55153 (or 55120 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1021023213012 its reverse (2103123201201), we get a palindrome (3124146414213).

The spelling of 1021023213012 in words is "one trillion, twenty-one billion, twenty-three million, two hundred thirteen thousand, twelve".