247019934121 has 3 divisors (see below), whose sum is σ = 247020431133. Its totient is φ = 247019437110.

The previous prime is 247019934067. The next prime is 247019934131. The reversal of 247019934121 is 121439910742.

It is a happy number.

The square root of 247019934121 is 497011.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 247019934121 - 2¹¹ = 247019932073 is a prime.

It is a super-2 number, since 2×247019934121² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247019934131) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 248506 + ... + 745516.

It is an arithmetic number, because the mean of its divisors is an integer number (82340143711).

Almost surely, 2^247019934121 is an apocalyptic number.

247019934121 is the 497011-st square number.

247019934121 is the 248506-th centered octagonal number.

It is an amenable number.

247019934121 is a deficient number, since it is larger than the sum of its proper divisors (497012).

247019934121 is an frugal number, since it uses more digits than its factorization.

247019934121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994022 (or 497011 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 247019934121 in words is "two hundred forty-seven billion, nineteen million, nine hundred thirty-four thousand, one hundred twenty-one".