21215452564094 has 32 divisors (see below), whose sum is σ = 32235972088320. Its totient is φ = 10470365069472.

The previous prime is 21215452564093. The next prime is 21215452564157. The reversal of 21215452564094 is 49046525451212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21215452564091) 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, 2051184287 + ... + 2051194629.

It is an arithmetic number, because the mean of its divisors is an integer number (1007374127760).

Almost surely, 2^{21215452564094} is an apocalyptic number.

21215452564094 is a deficient number, since it is larger than the sum of its proper divisors (11020519524226).

21215452564094 is a wasteful number, since it uses less digits than its factorization.

21215452564094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20504.

The product of its (nonzero) digits is 3456000, while the sum is 50.

The spelling of 21215452564094 in words is "twenty-one trillion, two hundred fifteen billion, four hundred fifty-two million, five hundred sixty-four thousand, ninety-four".