21021022020012 has 120 divisors (see below), whose sum is σ = 57247507192512. Its totient is φ = 6003170359200.

The previous prime is 21021022019957. The next prime is 21021022020077. The reversal of 21021022020012 is 21002022012012.

It is a junction number, because it is equal to n+sod(n) for n = 21021022019973 and 21021022020000.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 61227187 + ... + 61569557.

Almost surely, 2^{21021022020012} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21021022020012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28623753596256).

21021022020012 is an abundant number, since it is smaller than the sum of its proper divisors (36226485172500).

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

21021022020012 is a wasteful number, since it uses less digits than its factorization.

21021022020012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344537 (or 344514 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21021022020012 its reverse (21002022012012), we get a palindrome (42023044032024).

The spelling of 21021022020012 in words is "twenty-one trillion, twenty-one billion, twenty-two million, twenty thousand, twelve".