21352463072 has 12 divisors (see below), whose sum is σ = 42037661736. Its totient is φ = 10676231520.

The previous prime is 21352463059. The next prime is 21352463117. The reversal of 21352463072 is 27036425312.

It is a super-2 number, since 2×21352463072² (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 as a sum of consecutive naturals, namely, 333632204 + ... + 333632267.

It is an arithmetic number, because the mean of its divisors is an integer number (3503138478).

Almost surely, 2^21352463072 is an apocalyptic number.

It is an amenable number.

21352463072 is a deficient number, since it is larger than the sum of its proper divisors (20685198664).

21352463072 is an equidigital number, since it uses as much as digits as its factorization.

21352463072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667264481 (or 667264473 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 35.

Adding to 21352463072 its reverse (27036425312), we get a palindrome (48388888384).

The spelling of 21352463072 in words is "twenty-one billion, three hundred fifty-two million, four hundred sixty-three thousand, seventy-two".