21427291040 has 48 divisors (see below), whose sum is σ = 53286297120. Its totient is φ = 8119814400.

The previous prime is 21427291009. The next prime is 21427291069. The reversal of 21427291040 is 4019272412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 21427290988 and 21427291006.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3521186 + ... + 3527265.

It is an arithmetic number, because the mean of its divisors is an integer number (1110131190).

Almost surely, 2^21427291040 is an apocalyptic number.

21427291040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21427291040 is an abundant number, since it is smaller than the sum of its proper divisors (31859006080).

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

21427291040 is a wasteful number, since it uses less digits than its factorization.

21427291040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7048485 (or 7048477 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The spelling of 21427291040 in words is "twenty-one billion, four hundred twenty-seven million, two hundred ninety-one thousand, forty".