21202011012 has 192 divisors, whose sum is σ = 63240952320. Its totient is φ = 5377204224.

The previous prime is 21202010993. The next prime is 21202011037. The reversal of 21202011012 is 21011020212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8770828 + ... + 8773244.

It is an arithmetic number, because the mean of its divisors is an integer number (329379960).

Almost surely, 2^21202011012 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 21202011012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31620476160).

21202011012 is an abundant number, since it is smaller than the sum of its proper divisors (42038941308).

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

21202011012 is a wasteful number, since it uses less digits than its factorization.

21202011012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2750 (or 2748 counting only the distinct ones).

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

Adding to 21202011012 its reverse (21011020212), we get a palindrome (42213031224).

The spelling of 21202011012 in words is "twenty-one billion, two hundred two million, eleven thousand, twelve".