21054938949093 has 128 divisors (see below), whose sum is σ = 33622337781760. Its totient is φ = 11467788192000.

The previous prime is 21054938949059. The next prime is 21054938949119. The reversal of 21054938949093 is 39094983945012.

It is not a de Polignac number, because 21054938949093 - 2¹⁸ = 21054938686949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054938949053) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 13752408738 + ... + 13752410268.

It is an arithmetic number, because the mean of its divisors is an integer number (262674513920).

Almost surely, 2^{21054938949093} is an apocalyptic number.

It is an amenable number.

21054938949093 is a deficient number, since it is larger than the sum of its proper divisors (12567398832667).

21054938949093 is a wasteful number, since it uses less digits than its factorization.

21054938949093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799.

The product of its (nonzero) digits is 75582720, while the sum is 66.

The spelling of 21054938949093 in words is "twenty-one trillion, fifty-four billion, nine hundred thirty-eight million, nine hundred forty-nine thousand, ninety-three".