21156909141 has 8 divisors (see below), whose sum is σ = 28809408384. Its totient is φ = 13804508000.

The previous prime is 21156909097. The next prime is 21156909143. The reversal of 21156909141 is 14190965112.

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

It is a cyclic number.

It is not a de Polignac number, because 21156909141 - 2¹⁹ = 21156384853 is a prime.

It is a super-2 number, since 2×21156909141² (a number of 21 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 21156909141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21156909143) 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, 75024360 + ... + 75024641.

It is an arithmetic number, because the mean of its divisors is an integer number (3601176048).

Almost surely, 2^21156909141 is an apocalyptic number.

It is an amenable number.

21156909141 is a deficient number, since it is larger than the sum of its proper divisors (7652499243).

21156909141 is a wasteful number, since it uses less digits than its factorization.

21156909141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150049051.

The product of its (nonzero) digits is 19440, while the sum is 39.

The spelling of 21156909141 in words is "twenty-one billion, one hundred fifty-six million, nine hundred nine thousand, one hundred forty-one".