10212121020 has 48 divisors (see below), whose sum is σ = 29062702368. Its totient is φ = 2678588160.

The previous prime is 10212121019. The next prime is 10212121021. The reversal of 10212121020 is 2012121201.

It is an interprime number because it is at equal distance from previous prime (10212121019) and next prime (10212121021).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 10212120987 and 10212121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212121021) 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, 1391439 + ... + 1398758.

It is an arithmetic number, because the mean of its divisors is an integer number (605472966).

Almost surely, 2^10212121020 is an apocalyptic number.

10212121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10212121020 is an abundant number, since it is smaller than the sum of its proper divisors (18850581348).

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

10212121020 is a wasteful number, since it uses less digits than its factorization.

10212121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2790270 (or 2790268 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 10212121020 its reverse (2012121201), we get a palindrome (12224242221).

The spelling of 10212121020 in words is "ten billion, two hundred twelve million, one hundred twenty-one thousand, twenty".