21270605124 has 24 divisors (see below), whose sum is σ = 49761008640. Its totient is φ = 7071687904.

The previous prime is 21270605113. The next prime is 21270605141. The reversal of 21270605124 is 42150607212.

It is a super-2 number, since 2×21270605124² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21270605091 and 21270605100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2309439 + ... + 2318630.

It is an arithmetic number, because the mean of its divisors is an integer number (2073375360).

Almost surely, 2^21270605124 is an apocalyptic number.

It is an amenable number.

21270605124 is an abundant number, since it is smaller than the sum of its proper divisors (28490403516).

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

21270605124 is a wasteful number, since it uses less digits than its factorization.

21270605124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4628459 (or 4628457 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The spelling of 21270605124 in words is "twenty-one billion, two hundred seventy million, six hundred five thousand, one hundred twenty-four".