1900012521 has 32 divisors (see below), whose sum is σ = 2920942080. Its totient is φ = 1086480000.

The previous prime is 1900012519. The next prime is 1900012549. The reversal of 1900012521 is 1252100091.

It is not a de Polignac number, because 1900012521 - 2¹ = 1900012519 is a prime.

It is a super-2 number, since 2×1900012521² = 7220095159913550882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1900012571) 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, 151341 + ... + 163413.

It is an arithmetic number, because the mean of its divisors is an integer number (91279440).

Almost surely, 2^1900012521 is an apocalyptic number.

1900012521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1900012521 is a deficient number, since it is larger than the sum of its proper divisors (1020929559).

1900012521 is a wasteful number, since it uses less digits than its factorization.

1900012521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12357.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 1900012521 is about 43589.1330608903. The cubic root of 1900012521 is about 1238.5650503328.

The spelling of 1900012521 in words is "one billion, nine hundred million, twelve thousand, five hundred twenty-one".