21020012020012 has 6 divisors (see below), whose sum is σ = 36785021035028. Its totient is φ = 10510006010004.

The previous prime is 21020012019997. The next prime is 21020012020037. The reversal of 21020012020012 is 21002021002012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21020012019974 and 21020012020001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627501502498 + ... + 2627501502505.

Almost surely, 2^{21020012020012} is an apocalyptic number.

It is an amenable number.

21020012020012 is a deficient number, since it is larger than the sum of its proper divisors (15765009015016).

21020012020012 is a wasteful number, since it uses less digits than its factorization.

21020012020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5255003005007 (or 5255003005005 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21020012020012 its reverse (21002021002012), we get a palindrome (42022033022024).

The spelling of 21020012020012 in words is "twenty-one trillion, twenty billion, twelve million, twenty thousand, twelve".