21211532770 has 16 divisors (see below), whose sum is σ = 38190601728. Its totient is φ = 8482425840.

The previous prime is 21211532731. The next prime is 21211532773. The reversal of 21211532770 is 7723511212.

It is not an unprimeable number, because it can be changed into a prime (21211532773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232386 + ... + 310525.

It is an arithmetic number, because the mean of its divisors is an integer number (2386912608).

Almost surely, 2^21211532770 is an apocalyptic number.

21211532770 is a deficient number, since it is larger than the sum of its proper divisors (16979068958).

21211532770 is a wasteful number, since it uses less digits than its factorization.

21211532770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546825.

The product of its (nonzero) digits is 5880, while the sum is 31.

The spelling of 21211532770 in words is "twenty-one billion, two hundred eleven million, five hundred thirty-two thousand, seven hundred seventy".