21400003402557 has 32 divisors (see below), whose sum is σ = 31430061669888. Its totient is φ = 12869297511936.

The previous prime is 21400003402511. The next prime is 21400003402559. The reversal of 21400003402557 is 75520430000412.

It is not a de Polignac number, because 21400003402557 - 2⁷ = 21400003402429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400003402559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7742448 + ... + 10136345.

It is an arithmetic number, because the mean of its divisors is an integer number (982189427184).

Almost surely, 2^{21400003402557} is an apocalyptic number.

It is an amenable number.

21400003402557 is a deficient number, since it is larger than the sum of its proper divisors (10030058267331).

21400003402557 is a wasteful number, since it uses less digits than its factorization.

21400003402557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17879509.

The product of its (nonzero) digits is 33600, while the sum is 33.

Adding to 21400003402557 its reverse (75520430000412), we get a palindrome (96920433402969).

The spelling of 21400003402557 in words is "twenty-one trillion, four hundred billion, three million, four hundred two thousand, five hundred fifty-seven".