1055121421 has 8 divisors (see below), whose sum is σ = 1063014624. Its totient is φ = 1047258000.

The previous prime is 1055121383. The next prime is 1055121443. The reversal of 1055121421 is 1241215501.

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

It is a cyclic number.

It is not a de Polignac number, because 1055121421 - 2¹⁵ = 1055088653 is a prime.

It is a super-2 number, since 2×1055121421² = 2226562426106118482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1055121392 and 1055121401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055121451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66370 + ... + 80716.

It is an arithmetic number, because the mean of its divisors is an integer number (132876828).

Almost surely, 2^1055121421 is an apocalyptic number.

It is an amenable number.

1055121421 is a deficient number, since it is larger than the sum of its proper divisors (7893203).

1055121421 is a wasteful number, since it uses less digits than its factorization.

1055121421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14891.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 1055121421 is about 32482.6326057480. The cubic root of 1055121421 is about 1018.0461832677.

Adding to 1055121421 its reverse (1241215501), we get a palindrome (2296336922).

The spelling of 1055121421 in words is "one billion, fifty-five million, one hundred twenty-one thousand, four hundred twenty-one".