21020121012000 has 192 divisors, whose sum is σ = 75122091128448. Its totient is φ = 5095786880000.

The previous prime is 21020121011999. The next prime is 21020121012001. The reversal of 21020121012000 is 21012102012.

It is an interprime number because it is at equal distance from previous prime (21020121011999) and next prime (21020121012001).

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

It is not an unprimeable number, because it can be changed into a prime (21020121012001) 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, 79489671 + ... + 79753670.

It is an arithmetic number, because the mean of its divisors is an integer number (391260891294).

Almost surely, 2^{21020121012000} is an apocalyptic number.

21020121012000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020121012000 is an abundant number, since it is smaller than the sum of its proper divisors (54101970116448).

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

21020121012000 is a wasteful number, since it uses less digits than its factorization.

21020121012000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159243380 (or 159243362 counting only the distinct ones).

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

Adding to 21020121012000 its reverse (21012102012), we get a palindrome (21041133114012).

The spelling of 21020121012000 in words is "twenty-one trillion, twenty billion, one hundred twenty-one million, twelve thousand".