13521772213381 has 16 divisors (see below), whose sum is σ = 14340059937216. Its totient is φ = 12706041689856.

The previous prime is 13521772213363. The next prime is 13521772213511. The reversal of 13521772213381 is 18331227712531.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13521772213381 - 2²⁹ = 13521235342469 is a prime.

It is a super-2 number, since 2×13521772213381² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521772213321) 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, 31037995 + ... + 31470631.

It is an arithmetic number, because the mean of its divisors is an integer number (896253746076).

Almost surely, 2^{13521772213381} is an apocalyptic number.

It is an amenable number.

13521772213381 is a deficient number, since it is larger than the sum of its proper divisors (818287723835).

13521772213381 is a wasteful number, since it uses less digits than its factorization.

13521772213381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435588.

The product of its digits is 423360, while the sum is 46.

The spelling of 13521772213381 in words is "thirteen trillion, five hundred twenty-one billion, seven hundred seventy-two million, two hundred thirteen thousand, three hundred eighty-one".