21012112301020 has 24 divisors (see below), whose sum is σ = 44143692216624. Its totient is φ = 8401367513856.

The previous prime is 21012112301009. The next prime is 21012112301021. The reversal of 21012112301020 is 2010321121012.

It is a junction number, because it is equal to n+sod(n) for n = 21012112300985 and 21012112301003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012112301021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217288362 + ... + 217385041.

It is an arithmetic number, because the mean of its divisors is an integer number (1839320509026).

Almost surely, 2^{21012112301020} is an apocalyptic number.

21012112301020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012112301020 is an abundant number, since it is smaller than the sum of its proper divisors (23131579915604).

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

21012112301020 is a wasteful number, since it uses less digits than its factorization.

21012112301020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434675829 (or 434675827 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21012112301020 its reverse (2010321121012), we get a palindrome (23022433422032).

The spelling of 21012112301020 in words is "twenty-one trillion, twelve billion, one hundred twelve million, three hundred one thousand, twenty".