21512532011201 has 16 divisors (see below), whose sum is σ = 26820982533120. Its totient is φ = 16762909830480.

The previous prime is 21512532011161. The next prime is 21512532011221. The reversal of 21512532011201 is 10211023521512.

It is not a de Polignac number, because 21512532011201 - 2¹⁸ = 21512531749057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21512532011221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13411970 + ... + 14930036.

It is an arithmetic number, because the mean of its divisors is an integer number (1676311408320).

Almost surely, 2^{21512532011201} is an apocalyptic number.

It is an amenable number.

21512532011201 is a deficient number, since it is larger than the sum of its proper divisors (5308450521919).

21512532011201 is a wasteful number, since it uses less digits than its factorization.

21512532011201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702124.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 21512532011201 its reverse (10211023521512), we get a palindrome (31723555532713).

The spelling of 21512532011201 in words is "twenty-one trillion, five hundred twelve billion, five hundred thirty-two million, eleven thousand, two hundred one".