21653653215142 has 32 divisors (see below), whose sum is σ = 35114290912512. Its totient is φ = 9955364006784.

The previous prime is 21653653215109. The next prime is 21653653215143. The reversal of 21653653215142 is 24151235635612.

It is a super-4 number, since 4×21653653215142⁴ (a number of 54 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21653653215092 and 21653653215101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21653653215143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16168968 + ... + 17456884.

It is an arithmetic number, because the mean of its divisors is an integer number (1097321591016).

Almost surely, 2^{21653653215142} is an apocalyptic number.

21653653215142 is a deficient number, since it is larger than the sum of its proper divisors (13460637697370).

21653653215142 is a wasteful number, since it uses less digits than its factorization.

21653653215142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290432.

The product of its digits is 1296000, while the sum is 46.

The spelling of 21653653215142 in words is "twenty-one trillion, six hundred fifty-three billion, six hundred fifty-three million, two hundred fifteen thousand, one hundred forty-two".