21142042040 has 64 divisors (see below), whose sum is σ = 55131010560. Its totient is φ = 7146599040.

The previous prime is 21142042039. The next prime is 21142042073. The reversal of 21142042040 is 4024024112.

It is a super-2 number, since 2×21142042040² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 511862 + ... + 551621.

It is an arithmetic number, because the mean of its divisors is an integer number (861422040).

Almost surely, 2^21142042040 is an apocalyptic number.

21142042040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21142042040 is an abundant number, since it is smaller than the sum of its proper divisors (33988968520).

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

21142042040 is a wasteful number, since it uses less digits than its factorization.

21142042040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063572 (or 1063568 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21142042040 its reverse (4024024112), we get a palindrome (25166066152).

The spelling of 21142042040 in words is "twenty-one billion, one hundred forty-two million, forty-two thousand, forty".