21152061400 has 24 divisors (see below), whose sum is σ = 49178543220. Its totient is φ = 8460824480.

The previous prime is 21152061397. The next prime is 21152061409. The reversal of 21152061400 is 416025112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152061409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52879954 + ... + 52880353.

Almost surely, 2^21152061400 is an apocalyptic number.

21152061400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21152061400 is an abundant number, since it is smaller than the sum of its proper divisors (28026481820).

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

21152061400 is a wasteful number, since it uses less digits than its factorization.

21152061400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105760323 (or 105760314 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21152061400 its reverse (416025112), we get a palindrome (21568086512).

The spelling of 21152061400 in words is "twenty-one billion, one hundred fifty-two million, sixty-one thousand, four hundred".