21155152615406 has 8 divisors (see below), whose sum is σ = 31732767494784. Its totient is φ = 10577563450480.

The previous prime is 21155152615379. The next prime is 21155152615417. The reversal of 21155152615406 is 60451625155112.

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

It is a super-2 number, since 2×21155152615406² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4220135 + ... + 7753698.

It is an arithmetic number, because the mean of its divisors is an integer number (3966595936848).

Almost surely, 2^{21155152615406} is an apocalyptic number.

21155152615406 is a deficient number, since it is larger than the sum of its proper divisors (10577614879378).

21155152615406 is a wasteful number, since it uses less digits than its factorization.

21155152615406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12857226.

The product of its (nonzero) digits is 360000, while the sum is 44.

The spelling of 21155152615406 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred fifty-two million, six hundred fifteen thousand, four hundred six".