21023210286 has 240 divisors, whose sum is σ = 52814775024. Its totient is φ = 6244812288.

The previous prime is 21023210267. The next prime is 21023210287. The reversal of 21023210286 is 68201232012.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023210287) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 133905720 + ... + 133905876.

Almost surely, 2^21023210286 is an apocalyptic number.

21023210286 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023210286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26407387512).

21023210286 is an abundant number, since it is smaller than the sum of its proper divisors (31791564738).

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

21023210286 is a wasteful number, since it uses less digits than its factorization.

21023210286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 21023210286 its reverse (68201232012), we get a palindrome (89224442298).

The spelling of 21023210286 in words is "twenty-one billion, twenty-three million, two hundred ten thousand, two hundred eighty-six".