21094622142 has 128 divisors (see below), whose sum is σ = 50916999168. Its totient is φ = 5751283200.

The previous prime is 21094622141. The next prime is 21094622161. The reversal of 21094622142 is 24122649012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21094622141) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2883253 + ... + 2890559.

It is an arithmetic number, because the mean of its divisors is an integer number (397789056).

Almost surely, 2^21094622142 is an apocalyptic number.

21094622142 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 21094622142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25458499584).

21094622142 is an abundant number, since it is smaller than the sum of its proper divisors (29822377026).

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

21094622142 is a wasteful number, since it uses less digits than its factorization.

21094622142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7454.

The product of its (nonzero) digits is 13824, while the sum is 33.

The spelling of 21094622142 in words is "twenty-one billion, ninety-four million, six hundred twenty-two thousand, one hundred forty-two".