2151103521 has 32 divisors (see below), whose sum is σ = 3393126400. Its totient is φ = 1186508736.

The previous prime is 2151103519. The next prime is 2151103531. The reversal of 2151103521 is 1253011512.

It is not a de Polignac number, because 2151103521 - 2¹ = 2151103519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151103501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87780 + ... + 109578.

It is an arithmetic number, because the mean of its divisors is an integer number (106035200).

Almost surely, 2^2151103521 is an apocalyptic number.

2151103521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2151103521 is a deficient number, since it is larger than the sum of its proper divisors (1242022879).

2151103521 is a wasteful number, since it uses less digits than its factorization.

2151103521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21973.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 2151103521 is about 46379.9905239318. The cubic root of 2151103521 is about 1290.8836605167.

The spelling of 2151103521 in words is "two billion, one hundred fifty-one million, one hundred three thousand, five hundred twenty-one".