21212612061 has 8 divisors (see below), whose sum is σ = 28401824640. Its totient is φ = 14082570432.

The previous prime is 21212612027. The next prime is 21212612081. The reversal of 21212612061 is 16021621212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21212612061 - 2¹³ = 21212603869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212612011) 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, 14791900 + ... + 14793333.

It is an arithmetic number, because the mean of its divisors is an integer number (3550228080).

Almost surely, 2^21212612061 is an apocalyptic number.

It is an amenable number.

21212612061 is a deficient number, since it is larger than the sum of its proper divisors (7189212579).

21212612061 is a wasteful number, since it uses less digits than its factorization.

21212612061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29585475.

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 21212612061 in words is "twenty-one billion, two hundred twelve million, six hundred twelve thousand, sixty-one".