21511032010 has 16 divisors (see below), whose sum is σ = 41698308456. Its totient is φ = 7942534848.

The previous prime is 21511031999. The next prime is 21511032031. The reversal of 21511032010 is 1023011512.

It can be written as a sum of positive squares in 4 ways, for example, as 7537191489 + 13973840521 = 86817^2 + 118211^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82734609 + ... + 82734868.

Almost surely, 2^21511032010 is an apocalyptic number.

21511032010 is a deficient number, since it is larger than the sum of its proper divisors (20187276446).

21511032010 is a wasteful number, since it uses less digits than its factorization.

21511032010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165469497.

The product of its (nonzero) digits is 60, while the sum is 16.

Adding to 21511032010 its reverse (1023011512), we get a palindrome (22534043522).

The spelling of 21511032010 in words is "twenty-one billion, five hundred eleven million, thirty-two thousand, ten".