30726021221 has 8 divisors (see below), whose sum is σ = 37181067840. Its totient is φ = 24787378368.

The previous prime is 30726021203. The next prime is 30726021229. The reversal of 30726021221 is 12212062703.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30726021221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30726021229) 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, 129100811 + ... + 129101048.

It is an arithmetic number, because the mean of its divisors is an integer number (4647633480).

Almost surely, 2^30726021221 is an apocalyptic number.

It is an amenable number.

30726021221 is a deficient number, since it is larger than the sum of its proper divisors (6455046619).

30726021221 is a wasteful number, since it uses less digits than its factorization.

30726021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258201883.

The product of its (nonzero) digits is 2016, while the sum is 26.

Adding to 30726021221 its reverse (12212062703), we get a palindrome (42938083924).

The spelling of 30726021221 in words is "thirty billion, seven hundred twenty-six million, twenty-one thousand, two hundred twenty-one".