21554405125311 has 16 divisors (see below), whose sum is σ = 29241447822720. Its totient is φ = 14118735185760.

The previous prime is 21554405125307. The next prime is 21554405125313. The reversal of 21554405125311 is 11352150445512.

It is not a de Polignac number, because 21554405125311 - 2² = 21554405125307 is a prime.

It is a super-2 number, since 2×21554405125311² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21554405125311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554405125313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31190140 + ... + 31873713.

It is an arithmetic number, because the mean of its divisors is an integer number (1827590488920).

Almost surely, 2^{21554405125311} is an apocalyptic number.

21554405125311 is a deficient number, since it is larger than the sum of its proper divisors (7687042697409).

21554405125311 is a wasteful number, since it uses less digits than its factorization.

21554405125311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63065846.

The product of its (nonzero) digits is 120000, while the sum is 39.

The spelling of 21554405125311 in words is "twenty-one trillion, five hundred fifty-four billion, four hundred five million, one hundred twenty-five thousand, three hundred eleven".