21155236246149 has 8 divisors (see below), whose sum is σ = 28209069111552. Its totient is φ = 14102447105760.

The previous prime is 21155236246097. The next prime is 21155236246223. The reversal of 21155236246149 is 94164263255112.

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

It is not a de Polignac number, because 21155236246149 - 2¹⁵ = 21155236213381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155236246849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260883957 + ... + 260965034.

It is an arithmetic number, because the mean of its divisors is an integer number (3526133638944).

Almost surely, 2^{21155236246149} is an apocalyptic number.

It is an amenable number.

21155236246149 is a deficient number, since it is larger than the sum of its proper divisors (7053832865403).

21155236246149 is a wasteful number, since it uses less digits than its factorization.

21155236246149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521862507.

The product of its digits is 3110400, while the sum is 51.

The spelling of 21155236246149 in words is "twenty-one trillion, one hundred fifty-five billion, two hundred thirty-six million, two hundred forty-six thousand, one hundred forty-nine".