1221021197 has 8 divisors (see below), whose sum is σ = 1332574752. Its totient is φ = 1109559600.

The previous prime is 1221021173. The next prime is 1221021203. The reversal of 1221021197 is 7911201221.

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 1221021197 - 2²² = 1216826893 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 (1221029197) 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, 6422 + ... + 49832.

It is an arithmetic number, because the mean of its divisors is an integer number (166571844).

Almost surely, 2^1221021197 is an apocalyptic number.

It is an amenable number.

1221021197 is a deficient number, since it is larger than the sum of its proper divisors (111553555).

1221021197 is a wasteful number, since it uses less digits than its factorization.

1221021197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45979.

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 1221021197 is about 34943.1137278864. The cubic root of 1221021197 is about 1068.8277834386.

The spelling of 1221021197 in words is "one billion, two hundred twenty-one million, twenty-one thousand, one hundred ninety-seven".