21425635404 has 48 divisors (see below), whose sum is σ = 56097951840. Its totient is φ = 7071163200.

The previous prime is 21425635369. The next prime is 21425635447. The reversal of 21425635404 is 40453652412.

21425635404 is a `hidden beast` number, since 2 + 1 + 42 + 563 + 54 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 971199 + ... + 993014.

It is an arithmetic number, because the mean of its divisors is an integer number (1168707330).

Almost surely, 2^21425635404 is an apocalyptic number.

It is an amenable number.

21425635404 is an abundant number, since it is smaller than the sum of its proper divisors (34672316436).

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

21425635404 is a wasteful number, since it uses less digits than its factorization.

21425635404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1964327 (or 1964319 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 21425635404 in words is "twenty-one billion, four hundred twenty-five million, six hundred thirty-five thousand, four hundred four".