21426130040 has 192 divisors, whose sum is σ = 57005544960. Its totient is φ = 7225908480.

The previous prime is 21426130039. The next prime is 21426130043. The reversal of 21426130040 is 4003162412.

It is a junction number, because it is equal to n+sod(n) for n = 21426129988 and 21426130015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426130043) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42596429 + ... + 42596931.

It is an arithmetic number, because the mean of its divisors is an integer number (296903880).

Almost surely, 2^21426130040 is an apocalyptic number.

21426130040 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 21426130040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28502772480).

21426130040 is an abundant number, since it is smaller than the sum of its proper divisors (35579414920).

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

21426130040 is a wasteful number, since it uses less digits than its factorization.

21426130040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21426130040 its reverse (4003162412), we get a palindrome (25429292452).

The spelling of 21426130040 in words is "twenty-one billion, four hundred twenty-six million, one hundred thirty thousand, forty".