21903919197342 has 128 divisors (see below), whose sum is σ = 55260494327808. Its totient is φ = 5633823283200.

The previous prime is 21903919197311. The next prime is 21903919197353. The reversal of 21903919197342 is 24379191930912.

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, 5692242 + ... + 8729802.

It is an arithmetic number, because the mean of its divisors is an integer number (431722611936).

Almost surely, 2^{21903919197342} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21903919197342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27630247163904).

21903919197342 is an abundant number, since it is smaller than the sum of its proper divisors (33356575130466).

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

21903919197342 is a wasteful number, since it uses less digits than its factorization.

21903919197342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037914.

The product of its (nonzero) digits is 6613488, while the sum is 60.

The spelling of 21903919197342 in words is "twenty-one trillion, nine hundred three billion, nine hundred nineteen million, one hundred ninety-seven thousand, three hundred forty-two".