21985086453355 has 16 divisors (see below), whose sum is σ = 27233301648384. Its totient is φ = 17020610655840.

The previous prime is 21985086453277. The next prime is 21985086453389. The reversal of 21985086453355 is 55335468058912.

It is not a de Polignac number, because 21985086453355 - 2¹⁵ = 21985086420587 is a prime.

It is a super-2 number, since 2×21985086453355² (a number of 27 digits) contains 22 as substring.

It is a Duffinian 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, 35470944 + ... + 36085426.

It is an arithmetic number, because the mean of its divisors is an integer number (1702081353024).

Almost surely, 2^{21985086453355} is an apocalyptic number.

21985086453355 is a deficient number, since it is larger than the sum of its proper divisors (5248215195029).

21985086453355 is a wasteful number, since it uses less digits than its factorization.

21985086453355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845346.

The product of its (nonzero) digits is 155520000, while the sum is 64.

The spelling of 21985086453355 in words is "twenty-one trillion, nine hundred eighty-five billion, eighty-six million, four hundred fifty-three thousand, three hundred fifty-five".