1220021013015 has 48 divisors (see below), whose sum is σ = 2506314789888. Its totient is φ = 557723887776.

The previous prime is 1220021013011. The next prime is 1220021013047. The reversal of 1220021013015 is 5103101200221.

It is not a de Polignac number, because 1220021013015 - 2² = 1220021013011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220021013011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 71715247 + ... + 71732256.

It is an arithmetic number, because the mean of its divisors is an integer number (52214891456).

Almost surely, 2^{1220021013015} is an apocalyptic number.

1220021013015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220021013015 is an abundant number, since it is smaller than the sum of its proper divisors (1286293776873).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220021013015 is an equidigital number, since it uses as much as digits as its factorization.

1220021013015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143447530 (or 143447518 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 1220021013015 its reverse (5103101200221), we get a palindrome (6323122213236).

The spelling of 1220021013015 in words is "one trillion, two hundred twenty billion, twenty-one million, thirteen thousand, fifteen".