21475016333655 has 16 divisors (see below), whose sum is σ = 34369552149504. Its totient is φ = 11450166706080.

The previous prime is 21475016333609. The next prime is 21475016333669. The reversal of 21475016333655 is 55633361057412.

It is not a de Polignac number, because 21475016333655 - 2¹⁶ = 21475016268119 is a prime.

It is a super-2 number, since 2×21475016333655² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21475016333598 and 21475016333607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198402751 + ... + 198510960.

It is an arithmetic number, because the mean of its divisors is an integer number (2148097009344).

Almost surely, 2^{21475016333655} is an apocalyptic number.

21475016333655 is a deficient number, since it is larger than the sum of its proper divisors (12894535815849).

21475016333655 is a wasteful number, since it uses less digits than its factorization.

21475016333655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396917326.

The product of its (nonzero) digits is 6804000, while the sum is 51.

The spelling of 21475016333655 in words is "twenty-one trillion, four hundred seventy-five billion, sixteen million, three hundred thirty-three thousand, six hundred fifty-five".