21403710553655 has 8 divisors (see below), whose sum is σ = 25684477790784. Its totient is φ = 17122951692000.

The previous prime is 21403710553639. The next prime is 21403710553663. The reversal of 21403710553655 is 55635501730412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21403710553655 - 2⁴ = 21403710553639 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 7652690 + ... + 10068320.

It is an arithmetic number, because the mean of its divisors is an integer number (3210559723848).

Almost surely, 2^{21403710553655} is an apocalyptic number.

21403710553655 is a deficient number, since it is larger than the sum of its proper divisors (4280767237129).

21403710553655 is a wasteful number, since it uses less digits than its factorization.

21403710553655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4187737.

The product of its (nonzero) digits is 1890000, while the sum is 47.

The spelling of 21403710553655 in words is "twenty-one trillion, four hundred three billion, seven hundred ten million, five hundred fifty-three thousand, six hundred fifty-five".