21406654155 has 32 divisors (see below), whose sum is σ = 34966105920. Its totient is φ = 11179251200.

The previous prime is 21406654153. The next prime is 21406654183. The reversal of 21406654155 is 55145660412.

It is not a de Polignac number, because 21406654155 - 2¹ = 21406654153 is a prime.

It is a super-2 number, since 2×21406654155² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21406654153) 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, 378205 + ... + 431105.

It is an arithmetic number, because the mean of its divisors is an integer number (1092690810).

Almost surely, 2^21406654155 is an apocalyptic number.

21406654155 is a deficient number, since it is larger than the sum of its proper divisors (13559451765).

21406654155 is a wasteful number, since it uses less digits than its factorization.

21406654155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53471.

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 21406654155 in words is "twenty-one billion, four hundred six million, six hundred fifty-four thousand, one hundred fifty-five".