21423352830 has 32 divisors (see below), whose sum is σ = 56090233728. Its totient is φ = 5193540000.

The previous prime is 21423352823. The next prime is 21423352837. The reversal of 21423352830 is 3825332412.

It is an interprime number because it is at equal distance from previous prime (21423352823) and next prime (21423352837).

It is a super-3 number, since 3×21423352830³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 21423352791 and 21423352800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423352837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32459296 + ... + 32459955.

It is an arithmetic number, because the mean of its divisors is an integer number (1752819804).

Almost surely, 2^21423352830 is an apocalyptic number.

21423352830 is an abundant number, since it is smaller than the sum of its proper divisors (34666880898).

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

21423352830 is a wasteful number, since it uses less digits than its factorization.

21423352830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64919272.

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 21423352830 in words is "twenty-one billion, four hundred twenty-three million, three hundred fifty-two thousand, eight hundred thirty".