2154420521 has 8 divisors (see below), whose sum is σ = 2383380288. Its totient is φ = 1930978000.

The previous prime is 2154420517. The next prime is 2154420559. The reversal of 2154420521 is 1250244512.

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 2154420521 - 2² = 2154420517 is a prime.

It is a super-2 number, since 2×2154420521² = 9283055562611822882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2154420581) 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 7 ways as a sum of consecutive naturals, for example, 1378490 + ... + 1380051.

It is an arithmetic number, because the mean of its divisors is an integer number (297922536).

Almost surely, 2^2154420521 is an apocalyptic number.

It is an amenable number.

2154420521 is a deficient number, since it is larger than the sum of its proper divisors (228959767).

2154420521 is a wasteful number, since it uses less digits than its factorization.

2154420521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2758623.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 2154420521 is about 46415.7357046078. The cubic root of 2154420521 is about 1291.5468336382.

The spelling of 2154420521 in words is "two billion, one hundred fifty-four million, four hundred twenty thousand, five hundred twenty-one".