21138895465034 has 4 divisors (see below), whose sum is σ = 31708343197554. Its totient is φ = 10569447732516.

The previous prime is 21138895465027. The next prime is 21138895465043. The reversal of 21138895465034 is 43056459883112.

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., 19750158133225 + 1388737331809 = 4444115^2 + 1178447^2 .

It is a super-2 number, since 2×21138895465034² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5284723866257 + ... + 5284723866260.

Almost surely, 2^{21138895465034} is an apocalyptic number.

21138895465034 is a deficient number, since it is larger than the sum of its proper divisors (10569447732520).

21138895465034 is a wasteful number, since it uses less digits than its factorization.

21138895465034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10569447732519.

The product of its (nonzero) digits is 24883200, while the sum is 59.

The spelling of 21138895465034 in words is "twenty-one trillion, one hundred thirty-eight billion, eight hundred ninety-five million, four hundred sixty-five thousand, thirty-four".