21155142150202 has 4 divisors (see below), whose sum is σ = 31732713225306. Its totient is φ = 10577571075100.

The previous prime is 21155142150169. The next prime is 21155142150217. The reversal of 21155142150202 is 20205124155112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18462395710521 + 2692746439681 = 4296789^2 + 1640959^2 .

It is a super-4 number, since 4×21155142150202⁴ (a number of 54 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5288785537549 + ... + 5288785537552.

Almost surely, 2^{21155142150202} is an apocalyptic number.

21155142150202 is a deficient number, since it is larger than the sum of its proper divisors (10577571075104).

21155142150202 is a wasteful number, since it uses less digits than its factorization.

21155142150202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10577571075103.

The product of its (nonzero) digits is 8000, while the sum is 31.

The spelling of 21155142150202 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred forty-two million, one hundred fifty thousand, two hundred two".