21188748042 has 224 divisors, whose sum is σ = 61029062784. Its totient is φ = 5353776000.

The previous prime is 21188748019. The next prime is 21188748083. The reversal of 21188748042 is 24084788112.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 4151292 + ... + 4156392.

Almost surely, 2^21188748042 is an apocalyptic number.

21188748042 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 21188748042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30514531392).

21188748042 is an abundant number, since it is smaller than the sum of its proper divisors (39840314742).

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

21188748042 is a wasteful number, since it uses less digits than its factorization.

21188748042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5176 (or 5161 counting only the distinct ones).

The product of its (nonzero) digits is 229376, while the sum is 45.

The spelling of 21188748042 in words is "twenty-one billion, one hundred eighty-eight million, seven hundred forty-eight thousand, forty-two".