21122025424 has 40 divisors (see below), whose sum is σ = 42438156800. Its totient is φ = 10175787648.

The previous prime is 21122025409. The next prime is 21122025439. The reversal of 21122025424 is 42452022112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21122025409) and next prime (21122025439).

It is a super-2 number, since 2×21122025424² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 112224 + ... + 234175.

It is an arithmetic number, because the mean of its divisors is an integer number (1060953920).

Almost surely, 2^21122025424 is an apocalyptic number.

It is an amenable number.

21122025424 is an abundant number, since it is smaller than the sum of its proper divisors (21316131376).

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

21122025424 is a wasteful number, since it uses less digits than its factorization.

21122025424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346547 (or 346541 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 21122025424 its reverse (42452022112), we get a palindrome (63574047536).

The spelling of 21122025424 in words is "twenty-one billion, one hundred twenty-two million, twenty-five thousand, four hundred twenty-four".