21423667425 has 48 divisors (see below), whose sum is σ = 35894369280. Its totient is φ = 11273451840.

The previous prime is 21423667411. The next prime is 21423667429. The reversal of 21423667425 is 52476632412.

It is not a de Polignac number, because 21423667425 - 2⁴ = 21423667409 is a prime.

It is a super-2 number, since 2×21423667425² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21423667429) 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, 6017796 + ... + 6021354.

It is an arithmetic number, because the mean of its divisors is an integer number (747799360).

Almost surely, 2^21423667425 is an apocalyptic number.

21423667425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21423667425 is a deficient number, since it is larger than the sum of its proper divisors (14470701855).

21423667425 is a wasteful number, since it uses less digits than its factorization.

21423667425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4622 (or 4617 counting only the distinct ones).

The product of its digits is 483840, while the sum is 42.

The spelling of 21423667425 in words is "twenty-one billion, four hundred twenty-three million, six hundred sixty-seven thousand, four hundred twenty-five".