21445185402 has 16 divisors (see below), whose sum is σ = 47655967680. Its totient is φ = 7148395116.

The previous prime is 21445185353. The next prime is 21445185409. The reversal of 21445185402 is 20458154412.

21445185402 is a `hidden beast` number, since 21 + 44 + 51 + 8 + 540 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (21445185409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198566478 + ... + 198566585.

It is an arithmetic number, because the mean of its divisors is an integer number (2978497980).

Almost surely, 2^21445185402 is an apocalyptic number.

21445185402 is an abundant number, since it is smaller than the sum of its proper divisors (26210782278).

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

21445185402 is a wasteful number, since it uses less digits than its factorization.

21445185402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397133074 (or 397133068 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 36.

The spelling of 21445185402 in words is "twenty-one billion, four hundred forty-five million, one hundred eighty-five thousand, four hundred two".