21142291740 has 96 divisors (see below), whose sum is σ = 63159554304. Its totient is φ = 5265761280.

The previous prime is 21142291739. The next prime is 21142291759. The reversal of 21142291740 is 4719224112.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 54507 + ... + 212733.

It is an arithmetic number, because the mean of its divisors is an integer number (657912024).

Almost surely, 2^21142291740 is an apocalyptic number.

21142291740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21142291740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31579777152).

21142291740 is an abundant number, since it is smaller than the sum of its proper divisors (42017262564).

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

21142291740 is a wasteful number, since it uses less digits than its factorization.

21142291740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158387 (or 158385 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 21142291740 in words is "twenty-one billion, one hundred forty-two million, two hundred ninety-one thousand, seven hundred forty".