21390948633400 has 48 divisors (see below), whose sum is σ = 49734306923400. Its totient is φ = 8556319006080.

The previous prime is 21390948633391. The next prime is 21390948633427. The reversal of 21390948633400 is 433684909312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37447131 + ... + 38014069.

Almost surely, 2^{21390948633400} is an apocalyptic number.

21390948633400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21390948633400 is an abundant number, since it is smaller than the sum of its proper divisors (28343358290000).

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

21390948633400 is a wasteful number, since it uses less digits than its factorization.

21390948633400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755608 (or 755599 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 52.

The spelling of 21390948633400 in words is "twenty-one trillion, three hundred ninety billion, nine hundred forty-eight million, six hundred thirty-three thousand, four hundred".