21201211010990 has 32 divisors (see below), whose sum is σ = 40431253827744. Its totient is φ = 7976844252160.

The previous prime is 21201211010989. The next prime is 21201211011049. The reversal of 21201211010990 is 9901011210212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37123031 + ... + 37689810.

It is an arithmetic number, because the mean of its divisors is an integer number (1263476682117).

Almost surely, 2^{21201211010990} is an apocalyptic number.

21201211010990 is a deficient number, since it is larger than the sum of its proper divisors (19230042816754).

21201211010990 is a wasteful number, since it uses less digits than its factorization.

21201211010990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74814532.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 21201211010990 in words is "twenty-one trillion, two hundred one billion, two hundred eleven million, ten thousand, nine hundred ninety".