1221420053 has 16 divisors (see below), whose sum is σ = 1435969920. Its totient is φ = 1017100800.

The previous prime is 1221420049. The next prime is 1221420103. The reversal of 1221420053 is 3500241221.

It is a cyclic number.

It is not a de Polignac number, because 1221420053 - 2² = 1221420049 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221420353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60338 + ... + 77996.

It is an arithmetic number, because the mean of its divisors is an integer number (89748120).

Almost surely, 2^1221420053 is an apocalyptic number.

It is an amenable number.

1221420053 is a deficient number, since it is larger than the sum of its proper divisors (214549867).

1221420053 is a wasteful number, since it uses less digits than its factorization.

1221420053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17948.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1221420053 is about 34948.8204808117. The cubic root of 1221420053 is about 1068.9441510509.

Adding to 1221420053 its reverse (3500241221), we get a palindrome (4721661274).

The spelling of 1221420053 in words is "one billion, two hundred twenty-one million, four hundred twenty thousand, fifty-three".