1220514500021 has 16 divisors (see below), whose sum is σ = 1275200408064. Its totient is φ = 1165964439024.

The previous prime is 1220514500011. The next prime is 1220514500083. The reversal of 1220514500021 is 1200054150221.

It is a cyclic number.

It is not a de Polignac number, because 1220514500021 - 2⁶ = 1220514499957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220514500021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220514500011) 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, 82309610 + ... + 82324436.

It is an arithmetic number, because the mean of its divisors is an integer number (79700025504).

Almost surely, 2^{1220514500021} is an apocalyptic number.

It is an amenable number.

1220514500021 is a deficient number, since it is larger than the sum of its proper divisors (54685908043).

1220514500021 is a wasteful number, since it uses less digits than its factorization.

1220514500021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19160.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 1220514500021 its reverse (1200054150221), we get a palindrome (2420568650242).

The spelling of 1220514500021 in words is "one trillion, two hundred twenty billion, five hundred fourteen million, five hundred thousand, twenty-one".