19711477737121 has 9 divisors (see below), whose sum is σ = 20140007344081. Its totient is φ = 19291880364772.

The previous prime is 19711477737109. The next prime is 19711477737131. The reversal of 19711477737121 is 12173777411791.

The square root of 19711477737121 is 4439761.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 19711477737121 - 2¹¹ = 19711477735073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19711477737131) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 208621536 + ... + 208715998.

Almost surely, 2^{19711477737121} is an apocalyptic number.

19711477737121 is the 4439761-st square number.

19711477737121 is the 2219881-st centered octagonal number.

It is an amenable number.

19711477737121 is a deficient number, since it is larger than the sum of its proper divisors (428529606960).

19711477737121 is an frugal number, since it uses more digits than its factorization.

19711477737121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189020 (or 94510 counting only the distinct ones).

The product of its digits is 3630312, while the sum is 58.

The spelling of 19711477737121 in words is "nineteen trillion, seven hundred eleven billion, four hundred seventy-seven million, seven hundred thirty-seven thousand, one hundred twenty-one".