2151615421 has 8 divisors (see below), whose sum is σ = 2312184960. Its totient is φ = 1994824128.

The previous prime is 2151615413. The next prime is 2151615437. The reversal of 2151615421 is 1245161512.

2151615421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2151615421 - 2³ = 2151615413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2151615421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151615121) 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, 943381 + ... + 945658.

It is an arithmetic number, because the mean of its divisors is an integer number (289023120).

Almost surely, 2^2151615421 is an apocalyptic number.

It is an amenable number.

2151615421 is a deficient number, since it is larger than the sum of its proper divisors (160569539).

2151615421 is a wasteful number, since it uses less digits than its factorization.

2151615421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889123.

The product of its digits is 2400, while the sum is 28.

The square root of 2151615421 is about 46385.5087392604. The cubic root of 2151615421 is about 1290.9860499692.

Adding to 2151615421 its reverse (1245161512), we get a palindrome (3396776933).

The spelling of 2151615421 in words is "two billion, one hundred fifty-one million, six hundred fifteen thousand, four hundred twenty-one".