21006261062 has 4 divisors (see below), whose sum is σ = 31509391596. Its totient is φ = 10503130530.

The previous prime is 21006261049. The next prime is 21006261127. The reversal of 21006261062 is 26016260012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5251565264 + ... + 5251565267.

It is an arithmetic number, because the mean of its divisors is an integer number (7877347899).

Almost surely, 2^21006261062 is an apocalyptic number.

21006261062 is a deficient number, since it is larger than the sum of its proper divisors (10503130534).

21006261062 is a wasteful number, since it uses less digits than its factorization.

21006261062 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10503130533.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 21006261062 in words is "twenty-one billion, six million, two hundred sixty-one thousand, sixty-two".