10001212020 has 192 divisors, whose sum is σ = 33882912000. Its totient is φ = 2439424512.

The previous prime is 10001211973. The next prime is 10001212057. The reversal of 10001212020 is 2021210001.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 10001211993 and 10001212011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 280734 + ... + 314346.

It is an arithmetic number, because the mean of its divisors is an integer number (176473500).

Almost surely, 2^10001212020 is an apocalyptic number.

10001212020 is a gapful number since it is divisible by the number (10) 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 10001212020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16941456000).

10001212020 is an abundant number, since it is smaller than the sum of its proper divisors (23881699980).

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

10001212020 is a wasteful number, since it uses less digits than its factorization.

10001212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33679 (or 33671 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 10001212020 its reverse (2021210001), we get a palindrome (12022422021).

The spelling of 10001212020 in words is "ten billion, one million, two hundred twelve thousand, twenty".