21427732011240 has 128 divisors (see below), whose sum is σ = 71428740364800. Its totient is φ = 5713824510720.

The previous prime is 21427732011233. The next prime is 21427732011307. The reversal of 21427732011240 is 4211023772412.

21427732011240 is a `hidden beast` number, since 2 + 1 + 427 + 7 + 3 + 201 + 1 + 24 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21427732011195 and 21427732011204.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26407009 + ... + 27206351.

It is an arithmetic number, because the mean of its divisors is an integer number (558037034100).

Almost surely, 2^{21427732011240} is an apocalyptic number.

21427732011240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21427732011240 is an abundant number, since it is smaller than the sum of its proper divisors (50001008353560).

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

21427732011240 is a wasteful number, since it uses less digits than its factorization.

21427732011240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824184 (or 824174 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

Adding to 21427732011240 its reverse (4211023772412), we get a palindrome (25638755783652).

The spelling of 21427732011240 in words is "twenty-one trillion, four hundred twenty-seven billion, seven hundred thirty-two million, eleven thousand, two hundred forty".