21533200140 has 24 divisors (see below), whose sum is σ = 60292960560. Its totient is φ = 5742186688.

The previous prime is 21533200121. The next prime is 21533200159. The reversal of 21533200140 is 4100233512.

It is an interprime number because it is at equal distance from previous prime (21533200121) and next prime (21533200159).

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, 179443275 + ... + 179443394.

It is an arithmetic number, because the mean of its divisors is an integer number (2512206690).

Almost surely, 2^21533200140 is an apocalyptic number.

21533200140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21533200140 is an abundant number, since it is smaller than the sum of its proper divisors (38759760420).

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

21533200140 is a wasteful number, since it uses less digits than its factorization.

21533200140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358886681 (or 358886679 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21533200140 its reverse (4100233512), we get a palindrome (25633433652).

The spelling of 21533200140 in words is "twenty-one billion, five hundred thirty-three million, two hundred thousand, one hundred forty".