21010201212 has 384 divisors, whose sum is σ = 69310015488. Its totient is φ = 4777574400.

The previous prime is 21010201193. The next prime is 21010201229. The reversal of 21010201212 is 21210201012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 18221628 + ... + 18222780.

It is an arithmetic number, because the mean of its divisors is an integer number (180494832).

Almost surely, 2^21010201212 is an apocalyptic number.

21010201212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21010201212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34655007744).

21010201212 is an abundant number, since it is smaller than the sum of its proper divisors (48299814276).

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

21010201212 is a wasteful number, since it uses less digits than its factorization.

21010201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269 (or 1267 counting only the distinct ones).

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

Adding to 21010201212 its reverse (21210201012), we get a palindrome (42220402224).

It can be divided in two parts, 21010 and 201212, that added together give a palindrome (222222).

The spelling of 21010201212 in words is "twenty-one billion, ten million, two hundred one thousand, two hundred twelve".