21436465652 has 24 divisors (see below), whose sum is σ = 44255930880. Its totient is φ = 8890699680.

The previous prime is 21436465643. The next prime is 21436465679. The reversal of 21436465652 is 25656463412.

It is a happy number.

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, 12347327 + ... + 12349062.

It is an arithmetic number, because the mean of its divisors is an integer number (1843997120).

Almost surely, 2^21436465652 is an apocalyptic number.

It is an amenable number.

21436465652 is an abundant number, since it is smaller than the sum of its proper divisors (22819465228).

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

21436465652 is a wasteful number, since it uses less digits than its factorization.

21436465652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24696431 (or 24696429 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 44.

The spelling of 21436465652 in words is "twenty-one billion, four hundred thirty-six million, four hundred sixty-five thousand, six hundred fifty-two".