1220015500421 has 16 divisors (see below), whose sum is σ = 1231826270400. Its totient is φ = 1208272369920.

The previous prime is 1220015500381. The next prime is 1220015500453. The reversal of 1220015500421 is 1240055100221.

It is a cyclic number.

It is not a de Polignac number, because 1220015500421 - 2³⁰ = 1218941758597 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 (1220015500481) 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, 51795755 + ... + 51819303.

It is an arithmetic number, because the mean of its divisors is an integer number (76989141900).

Almost surely, 2^{1220015500421} is an apocalyptic number.

It is an amenable number.

1220015500421 is a deficient number, since it is larger than the sum of its proper divisors (11810769979).

1220015500421 is a wasteful number, since it uses less digits than its factorization.

1220015500421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24964.

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

The spelling of 1220015500421 in words is "one trillion, two hundred twenty billion, fifteen million, five hundred thousand, four hundred twenty-one".