21355421137000 has 64 divisors (see below), whose sum is σ = 50010456272400. Its totient is φ = 8535540966400.

The previous prime is 21355421136997. The next prime is 21355421137003. The reversal of 21355421137000 is 73112455312.

It is an interprime number because it is at equal distance from previous prime (21355421136997) and next prime (21355421137003).

It can be written as a sum of positive squares in 8 ways, for example, as 2724302098116 + 18631119038884 = 1650546^2 + 4316378^2 .

It is a super-3 number, since 3×21355421137000³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21355421137003) 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, 6994717 + ... + 9572716.

Almost surely, 2^{21355421137000} is an apocalyptic number.

21355421137000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21355421137000 is an abundant number, since it is smaller than the sum of its proper divisors (28655035135400).

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

21355421137000 is a wasteful number, since it uses less digits than its factorization.

21355421137000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16568743 (or 16568729 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 21355421137000 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred twenty-one million, one hundred thirty-seven thousand".