21155142253526 has 8 divisors (see below), whose sum is σ = 31732769759544. Its totient is φ = 10577552333680.

The previous prime is 21155142253499. The next prime is 21155142253579. The reversal of 21155142253526 is 62535224155112.

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

It is a super-2 number, since 2×21155142253526² (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, 7944560 + ... + 10267731.

It is an arithmetic number, because the mean of its divisors is an integer number (3966596219943).

Almost surely, 2^{21155142253526} is an apocalyptic number.

21155142253526 is a deficient number, since it is larger than the sum of its proper divisors (10577627506018).

21155142253526 is a wasteful number, since it uses less digits than its factorization.

21155142253526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18793086.

The product of its digits is 720000, while the sum is 44.

The spelling of 21155142253526 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred forty-two million, two hundred fifty-three thousand, five hundred twenty-six".