31721212901 has 8 divisors (see below), whose sum is σ = 36278302464. Its totient is φ = 27170495280.

The previous prime is 31721212847. The next prime is 31721212927. The reversal of 31721212901 is 10921212713.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31721212901 - 2⁶ = 31721212837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31721212931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1582310 + ... + 1602231.

It is an arithmetic number, because the mean of its divisors is an integer number (4534787808).

Almost surely, 2^31721212901 is an apocalyptic number.

It is an amenable number.

31721212901 is a deficient number, since it is larger than the sum of its proper divisors (4557089563).

31721212901 is a wasteful number, since it uses less digits than its factorization.

31721212901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3185971.

The product of its (nonzero) digits is 1512, while the sum is 29.

The spelling of 31721212901 in words is "thirty-one billion, seven hundred twenty-one million, two hundred twelve thousand, nine hundred one".