21391602000 has 320 divisors, whose sum is σ = 70683595008. Its totient is φ = 5564160000.

The previous prime is 21391601981. The next prime is 21391602047. The reversal of 21391602000 is 20619312.

It is a super-2 number, since 2×21391602000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 77225862 + ... + 77226138.

Almost surely, 2^21391602000 is an apocalyptic number.

21391602000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21391602000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35341797504).

21391602000 is an abundant number, since it is smaller than the sum of its proper divisors (49291993008).

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

21391602000 is a wasteful number, since it uses less digits than its factorization.

21391602000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575 (or 559 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The spelling of 21391602000 in words is "twenty-one billion, three hundred ninety-one million, six hundred two thousand".