21712023102 has 256 divisors, whose sum is σ = 59687239680. Its totient is φ = 5094835200.

The previous prime is 21712023077. The next prime is 21712023103. The reversal of 21712023102 is 20132021712.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21712023103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 19864068 + ... + 19865160.

It is an arithmetic number, because the mean of its divisors is an integer number (233153280).

Almost surely, 2^21712023102 is an apocalyptic number.

21712023102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21712023102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29843619840).

21712023102 is an abundant number, since it is smaller than the sum of its proper divisors (37975216578).

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

21712023102 is a wasteful number, since it uses less digits than its factorization.

21712023102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239.

The product of its (nonzero) digits is 336, while the sum is 21.

Adding to 21712023102 its reverse (20132021712), we get a palindrome (41844044814).

The spelling of 21712023102 in words is "twenty-one billion, seven hundred twelve million, twenty-three thousand, one hundred two".