1221201010 has 8 divisors (see below), whose sum is σ = 2198161836. Its totient is φ = 488480400.

The previous prime is 1221200993. The next prime is 1221201019. The reversal of 1221201010 is 101021221.

It can be written as a sum of positive squares in 2 ways, for example, as 1219615929 + 1585081 = 34923^2 + 1259^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 122120101 = 1221201010 / (1 + 2 + 2 + 1 + 2 + 0 + 1 + 0 + 1 + 0).

It is not an unprimeable number, because it can be changed into a prime (1221201019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61060041 + ... + 61060060.

Almost surely, 2^1221201010 is an apocalyptic number.

1221201010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221201010 is a deficient number, since it is larger than the sum of its proper divisors (976960826).

1221201010 is a wasteful number, since it uses less digits than its factorization.

1221201010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122120108.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1221201010 is about 34945.6865721651. The cubic root of 1221201010 is about 1068.8802476375.

Adding to 1221201010 its reverse (101021221), we get a palindrome (1322222231).

The spelling of 1221201010 in words is "one billion, two hundred twenty-one million, two hundred one thousand, ten".