21520141425 has 48 divisors (see below), whose sum is σ = 39620370880. Its totient is φ = 11452129920.

The previous prime is 21520141397. The next prime is 21520141427. The reversal of 21520141425 is 52414102512.

It is a happy number.

21520141425 is a `hidden beast` number, since 21 + 5 + 201 + 414 + 25 = 666.

It is not a de Polignac number, because 21520141425 - 2¹⁰ = 21520140401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21520141427) 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, 273594 + ... + 343356.

Almost surely, 2^21520141425 is an apocalyptic number.

21520141425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21520141425 is a deficient number, since it is larger than the sum of its proper divisors (18100229455).

21520141425 is a wasteful number, since it uses less digits than its factorization.

21520141425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70239 (or 70228 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 21520141425 its reverse (52414102512), we get a palindrome (73934243937).

The spelling of 21520141425 in words is "twenty-one billion, five hundred twenty million, one hundred forty-one thousand, four hundred twenty-five".