21702170239134 has 128 divisors (see below), whose sum is σ = 55863017570304. Its totient is φ = 5454809136000.

The previous prime is 21702170239121. The next prime is 21702170239147. The reversal of 21702170239134 is 43193207120712.

It is an interprime number because it is at equal distance from previous prime (21702170239121) and next prime (21702170239147).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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, 501635064 + ... + 501678324.

It is an arithmetic number, because the mean of its divisors is an integer number (436429824768).

Almost surely, 2^{21702170239134} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21702170239134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27931508785152).

21702170239134 is an abundant number, since it is smaller than the sum of its proper divisors (34160847331170).

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

21702170239134 is a wasteful number, since it uses less digits than its factorization.

21702170239134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78342.

The product of its (nonzero) digits is 127008, while the sum is 42.

Adding to 21702170239134 its reverse (43193207120712), we get a palindrome (64895377359846).

The spelling of 21702170239134 in words is "twenty-one trillion, seven hundred two billion, one hundred seventy million, two hundred thirty-nine thousand, one hundred thirty-four".