29721212947 has 2 divisors, whose sum is σ = 29721212948. Its totient is φ = 29721212946.

The previous prime is 29721212903. The next prime is 29721212993. The reversal of 29721212947 is 74921212792.

It is an a-pointer prime, because the next prime (29721212993) can be obtained adding 29721212947 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29721212947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 29721212897 and 29721212906.

It is not a weakly prime, because it can be changed into another prime (29721215947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14860606473 + 14860606474.

It is an arithmetic number, because the mean of its divisors is an integer number (14860606474).

Almost surely, 2^29721212947 is an apocalyptic number.

29721212947 is a deficient number, since it is larger than the sum of its proper divisors (1).

29721212947 is an equidigital number, since it uses as much as digits as its factorization.

29721212947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 46.

The spelling of 29721212947 in words is "twenty-nine billion, seven hundred twenty-one million, two hundred twelve thousand, nine hundred forty-seven".