21489363830 has 16 divisors (see below), whose sum is σ = 42197296464. Its totient is φ = 7814314080.

The previous prime is 21489363823. The next prime is 21489363881. The reversal of 21489363830 is 3836398412.

It is a happy number.

It is a super-2 number, since 2×21489363830² (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 in 7 ways as a sum of consecutive naturals, for example, 97678817 + ... + 97679036.

It is an arithmetic number, because the mean of its divisors is an integer number (2637331029).

Almost surely, 2^21489363830 is an apocalyptic number.

21489363830 is a deficient number, since it is larger than the sum of its proper divisors (20707932634).

21489363830 is a wasteful number, since it uses less digits than its factorization.

21489363830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195357871.

The product of its (nonzero) digits is 746496, while the sum is 47.

The spelling of 21489363830 in words is "twenty-one billion, four hundred eighty-nine million, three hundred sixty-three thousand, eight hundred thirty".