221157029 has 16 divisors (see below), whose sum is σ = 250967808. Its totient is φ = 193704192.

The previous prime is 221157011. The next prime is 221157031. The reversal of 221157029 is 920751122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221157029 is a prime.

It is a super-2 number, since 2×221157029² = 97820862952213682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221156992 and 221157010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221157059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6824 + ... + 22110.

It is an arithmetic number, because the mean of its divisors is an integer number (15685488).

Almost surely, 2^221157029 is an apocalyptic number.

It is an amenable number.

221157029 is a deficient number, since it is larger than the sum of its proper divisors (29810779).

221157029 is a wasteful number, since it uses less digits than its factorization.

221157029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15364.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 221157029 is about 14871.3492662905. The cubic root of 221157029 is about 604.7375215480.

The spelling of 221157029 in words is "two hundred twenty-one million, one hundred fifty-seven thousand, twenty-nine".