21430501425 has 48 divisors (see below), whose sum is σ = 39417596160. Its totient is φ = 11415384000.

The previous prime is 21430501423. The next prime is 21430501441. The reversal of 21430501425 is 52410503412.

21430501425 is a `hidden beast` number, since 214 + 305 + 0 + 142 + 5 = 666.

It is not a de Polignac number, because 21430501425 - 2¹ = 21430501423 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 (21430501423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 534840 + ... + 573510.

It is an arithmetic number, because the mean of its divisors is an integer number (821199920).

Almost surely, 2^21430501425 is an apocalyptic number.

21430501425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21430501425 is a deficient number, since it is larger than the sum of its proper divisors (17987094735).

21430501425 is a wasteful number, since it uses less digits than its factorization.

21430501425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39511 (or 39500 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 21430501425 in words is "twenty-one billion, four hundred thirty million, five hundred one thousand, four hundred twenty-five".